lecture preflight 10
1: Student 1 because the electrons have two path choices. One
half of the electrons will take one side of the parallel circuit and the
other half will take the other side.
2: AC means alternating current because the current flow
alternates between positive and negative directions while DC, or direct
current, does not change direction. AC electricity can travel farther
distances before losing power, therefore being more efficent than DC.
3: I better understand the difference between amps and voltage. I
did not have a clue before!
4: Why do ice cubes stick to your skin when you first take them
out of the freezer?
lecture preflight 10
1: I agree with Student 2 because they have the correct reasoning
for the amount of current flowing through the circut. Because circut B
is a parallel circut, there needs to be more current to get each bulb to
light as bright as the one bulb in circut A.
2: AC=alternating current and DC=direct current Alternating
current, as its name suggests, is an electrical current that changes
direction while direct current is a constant flow of electrons in a
single direction.
3: The graphite/carbon inside of pencils is a good conductor of
electricity.
4: How can the weather change from HOT to COLD so quickly?
lecture preflight 10
1: I don't agree with either. All three bulbs will have the same
brightness. The parallel circuit makes it so each bulb is the same
brightness, when compared to A.
2: AC electricity is alternating current, and it can reach a
farther distance from one spot. DC electricty is direct current, and
cannot reach as far for people/things to use. DC was used for a long
time before AC.
3: That connecting a wire to the positive and negative of a
battery without a bulb, you will short circuit it.
4: Once a car comes to a stop, why do they make it so you have to
keep your foot on the brake? Like why doesn't it just stop until you
press the gas again?
lecture preflight 10
1: i agree with student two. Circuit B allows two different
paths, since each bulb is more resistant than the wire, two paths is
better than one.
2: AC is alternating current and DC is direct current. Direct,
the current moves in only one direction and is a much lower voltage than
AC. Batteries use DC. AC goes in alternating directions and is used in
most everyday things like the electricity from the wall.
3: that is you mix in salt to water it can conduct electricity.
4: if water without salt or other things in it is not that good
of a conductor than why is it so dangerous to have electrical appliances
fall in the water.
lecture preflight 10
1: Neither. The current will always be the same across the
circuit, no matter how the circuit is contstructed. Also, the current
between the two lightbulbs in part B is the same because the circuit is
set up in parallet. The three lightbulbs will have the same brightness.
2: A/C: Alternating Current D/C: Direct Current
3: You can use steel wool and a battery to light the steel wool
on fire.
4: What's the difference between a flourescent light and a
conventional light bulb?
lecture preflight 10
1: I agree with student 1's agrument. I believe that the flow
will be more in circuit B than circuit A since it is hooked up to two
bulbs. The brightness will be equal.
2: n DC, the electrons flow steadily in a single direction,
forward. In AC, electrons keep switching directions, sometimes going
forwards and then going backwards.
3: That baking soda is a conductor.
4: How does a flash on a camera work?
lecture preflight 10
1: Student 2-- there are twice as many circuits, so there is
twice as much flowing from the battery.
2: AC = Alternating Current: direction of current switches many
times (50-60) per second and is used in home appliances most often; DC =
Direct Current: direction doesn't change; not as useful; harder to
generate I don't really see why DC exists-- AC seems so much more
useful!
3: Baking soda conducts electricity! Whodda thunk?
4: Why does D/C exist?!?
lecture preflight 10
1: I agree with student 1, because we know that the battery is
giving off the same amount of current in each cases, and that current
does not increase as it moves through the bulbs. Although the current is
divided between the two bulbs, they still have the same brightness as in
circuit A because it is set up as a parallel circuit.
2: D/C refers to the direct current which comes from the
batteries. A/C refers to the alternating current which comes out of the
plugs in the walls and is produced in power stations. A/C is much more
powerful than D/C.
3: I thought it was very interesting how parallel circuits
produced the same amount of brightness as the single-bulb circuits.
4: What happens when your body burns calories?
lecture preflight 10
1: 2 because the bulbs will be about the same brightness but
there is more current through B.
2: AC means alternating current and DC is direct Current. in a
circuit the current flows in one direction for DC and it changes
direction in AC.
3: how to make fire with a battery and steel wool
4: how do electric guitars work?
lecture preflight 10
1: Students 2 has the right idea.
2: One is more intense? None of my friends knew.
3: parallel circuits have the same brightness as single circuits.
4: How do seasons work?
lecture preflight 10
1: I agree with student 1. As I saw in this week's lab, the
current flows through circuit A and makes it extremely bright.
However,in the 2nd diagram, the current is divided between two bulbs,
making the brightness of those two bulbs less bright than the bulb in
diagram A.
2: According to PBS.org, in 1887, DC electricity was king. But
becasue of DC electricity's limitations, power plans could only send DC
electgricity about a mile before the electricity began to lose power.
But then a system based on high-voltage alternatingt current was
introduced, which could carry electricity hundreds of miles with little
loss of power.
3: Salt and baking soda in water can generate electricty. Very
cool!
4: When they have statistics like, "50 million people watched
that episode of tv last night", how do they know that?
lecture preflight 10
1: I agree with student 1. I think that the current through the
battery in each circuit is the same and it is divided between the two
bulbs. This is a parallel circuit. Unlike a series circuit, the current
is the same through both bulbs and the resistance is less than in a
series circuit. I disagree with student 2 when he or she says that the
flow through the battery in circuit B is more than that through the
battery in circuit A.
2: Nobody I asked knew what the difference was, however,
wisegeek.com said that AC DC has to do with the way electrons flow. He
says, "In DC, the electrons flow steadily in a single direction, or
"forward." In AC, electrons keep switching directions, sometimes going
"forwards" and then going "backwards." The power that comes from our
wall outlets is AC, the more common, efficient kind." (www.wisegeek.com)
3: I learned about resistance in relation to currents, I learned
how to make a complete closed circuit with a battery, small lightbulb,
and a wire, and I learned how to slightly burn steel wool with an
electric current.
4: What are the components of fire? Why do people sometimes try
and argue that it's alive?
lecture preflight 10
1: I agree with student 2. Because the set up is a parallel
circuit so both bulbs are recieving the same amount of electric current
so they both have the same brightness.
2: AC stands for alternating current, meaning the current flows
in one direction and then the other, continually changing directions.
Also an AC voltage is continually chaning between positive and negative.
DC stands for direct current, meaning that the current always flows in
the same direction but it may increase or decrease. A DC voltage is
always positive.
3: That plain bath water is not a good conductor of electricity.
4: Why do they always put those labels on things like hairdryers
if water does not conduct electricity well on its on.
lecture preflight 10
1: I agree with neither because student 1 is wrong because the
bulbs B are going to be just as bring in A and with student 2, each
battery has the same voltage so the same electric current running
through the circuit.
2: AC electricty is alternating electricity, the type found in
homes and businesses, because it alternates its direction. DC electricty
is direct electricty because it is continuous in one direction. Also, AC
power can be easily converted from one voltage to another.
3: I learned why it is dangerous to have electricty appliances
running by the bathtub and also why you have to get out of the pool when
lightening is seen in the distance.
4: Is it possible to become resistance to being electrocuted?
lecture preflight 10
1: Student 1 because there is more resistance in B and thus the
current is smaller
2: d/c current flows in one way but ac current has alternating
current.
3: The battery bulb setup
4: how do generators work?
lecture preflight 10
1: Student 1 because the circuit is a parallel circuit which
means that the current is split between the two bulbs thus creating the
bulbs to be slightly more dull.
2: A/C stands for alternating current and D/C stands for direct
current. A thermal imaging system that is A/C-coupled has a signal that
is centered around the “local average temperature” without an offset or
pedestal. This occurs independently across the array. Because of this it
only has to deal with the smaller A/C signal and it therefore has the
capability of handling substantially greater temperature variations in
the scene. If the scene never changes, there is no A/C component to the
signal. Therefore A/C-coupled systems employ a chopper. Additionally,
most A/C-coupled systems do not calculate temperature from the pixels of
the sensor. TICs that use A/C-coupled sensors and have temperature
measurement use a fixed, separate pyrometer. A thermal imaging system
that is D/C-Coupled must handle the relatively very large offset as well
as the signal of interest. This complicates the system because the
offsets differ from pixel to pixel, and they vary slowly with time
increasing spatial noise in the system. Because of this, DC-Coupled
systems must employ a shutter to periodically re-calibrate the scene and
minimize Spatial Noise. TICs that use D/C-coupled sensors can have
“through the lens” temperature measurement directly from the pixels of
the sensor.
3: That working with circuits is a lot of fun because you can
experiment with the brightness/dullness of bulbs.
4: How do people know which chicken eggs will be fertilized eggs
or which eggs will be sent out to the grocery stores?
lecture preflight 10
1: I agree with student 2. Both light bulbs would be about the
same intensity and therefore there must be more current through circuit
B. Circuit B would be empty before A would.
2: AC is alternative current meaning it will adjust current
accordingly whereas DC is direct current and will not.
3: The current will change due to the difference in the design of
the circuit.
4: Why do people breathe into paper bags when they feel nautious?
lecture preflight 10
1: Student 2, In class the bulbs had the same brightness.
2: AC means Alternating current, and DC means Direct current. AC
carries a current longer, and DC carries a current shorter lengths and
is used in batteries.
3: That a wire gets hot if you attach it to both sides of a
battery.
4: How do generators work?
lecture preflight 10
1: I don't agree with either student because the first student is
saying that each bulb has half the current and student 2 is saying that
the flow through the battery in circuit B is more than that through the
battery in circuit A and in reality they have the same amount of current
going through both the circuits.
2: I asked my roommate and she said that A/C stands for
"accelerated current" and D/C is "deterred current" which means... fast
and slow.
3: I learned that pencil lead can actually be a conductor.
4: Why do batteries leak?
lecture preflight 10
1: I agree with neither. The brightness of the bulbs in circuit B
is the same as the one bulb in circuit A. Also the same amount of
current is going through both circuits, the amount of flow is the same.
2: A/C electricity is alternating current while D/C electricity
is direct current.
3: Gas is the solution through which the current is passed.
4: What is the difference between a close and open circuit?
lecture preflight 10
1: Student 2. Even though the brightness is the same, the battery
is working twice as hard to create the current (because it has to light
two bulbs) so it'll burn out in half the time that Battery A will.
2: Alternating current (A/C) electricity is more high-voltage
power that can "carry electricity hundreds of miles with little loss of
power" (pbs.org website). Direct current (D/C) electricity loses power
easily.
3: I learned about resistence in electric currents--interesting!
4: What is sodium laurel sulfate? I think I saw the sign at my
dentist's office.
lecture preflight 10
1: I agree with student 2. We learned that in parallel circuits
the same voltage is running through each of the bulbs, and is equal to
the voltage coming from the battery. Current is voltage over resistance.
The resistance and voltage are the same for both circuits, which means
they both have the same current runing through them.
2: They stand for alternating current and direct current. DC
current is either always positve or always negative, and AC is both
positive and negative. The difference in the direction of flow is that
AC flows one way and then the other, continually changing direction, and
DC flows in one direction.
3: I learned that parallel circuits provide the same amount of
light to each lightbulb.
4: What do the electrolytes in Gatorade do?
lecture preflight 10
1: Student 2 is correct. The current is the same within circuit A
and B. However, in circuit B the current flow will be twice as much
because of the two bulbs, using more power, but they will be equally as
bright.
2: D/C is the direct current and A/C is the alternating current.
3: I=V/R
4: How do video games work?
lecture preflight 10
1: neither. the amount od current is equal in ALL bulbs.
2: those are alternating and direct current. direct always flows
from neg to pos, while ac alternates directions
3: batteries can burn that silver metal stuff! fun fun :)
4: how is it that you can hook a battery up to a garage door
opener (the little dial pad to punch in a code) and it can open the
garage?
lecture preflight 10
1: Student 1. Student 2 is wrong because the current of both
circuits are the same.
2: D/C is direct current and A/C is alternating current. D/C
outputs a constant voltage, while A/C output fluctuates between positive
and negative voltage.
3: Parallel circuits use the same amount of voltage.
4: Nothing
lecture preflight 10
1: I don't really agree with either... both bulbs have the same
amount of current flowing through them, but this isn't necessarily
explained by the fact that the bulbs are all the same brightness.
2: D/C stands for direct current and comes from batteries. A/C
stands for alternating current and comes from plugs in the wall; it is
produced in power stations.
3: I learned that there is really only 1 way to build a simple
circuit (2 if you count that you can attach the light bulb to either
side).
4: Are the rays in a tanning bed the same as the ones really
produced by the sun?
lecture preflight 10
1: I believe student 2 except their last statement (flow through
battery in circuit B is more than that through the battery in circuit A.
I believe they are the same.
2: A/C stands for alternating current and D/C stands for direct
current. A thermal imaging system that is A/C-coupled has a signal that
is centered around the “local average temperature” without an offset or
pedestal. This occurs independently across the array. Because of this it
only has to deal with the smaller A/C signal and it therefore has the
capability of handling substantially greater temperature variations in
the scene. If the scene never changes, there is no A/C component to the
signal. Therefore A/C-coupled systems employ a chopper. Additionally,
most A/C-coupled systems do not calculate temperature from the pixels of
the sensor. TICs that use A/C-coupled sensors and have temperature
measurement use a fixed, separate pyrometer. A thermal imaging system
that is D/C-Coupled must handle the relatively very large offset as well
as the signal of interest. This complicates the system because the
offsets differ from pixel to pixel, and they vary slowly with time
increasing spatial noise in the system. Because of this, DC-Coupled
systems must employ a shutter to periodically re-calibrate the scene and
minimize Spatial Noise. TICs that use D/C-coupled sensors can have
“through the lens” temperature measurement directly from the pixels of
the sensor
3: What a parallel circuit was.
4: How many layers of skin do I have and does everyone have the
same amount of layers?
lecture preflight 10
1: 2, V=IR. Since the voltage of the batteries are the same, you
have to look at the resistance to find the current. If the resistance
goes up, then the current goes down. In circuit B, the resistance goes
down, so the current goes up.
2: DC is direct current and the electrons flow continuously. AC
is alternating current and the electrons repeatedly switch which
direction they are moving in.
3: Pure H2O does not conduct electricity.
4: How is lightning formed?
lecture preflight 10
1: Student 2 is correct because there are more passage ways for
current for the circut B, therefore there is more flow of energy.
2: ac=alternating current dc= direct current DC=electrons flow
steadily in a single direction "forward" AC=electrons keep switching
directions, sometimes "forwards" and then "backwards" AC is more common
and effiecient.
3: salt water conducts electricity, but distilled water does
not...
4: How does soap break surface tension?
lecture preflight 10
1: I don't agree with either student. First of all, the last
comment from each student completely contradicts what they began to talk
about. Secondly, the current through these two circuits are not the
same. Curcuit B's flow is greater than Curcuit A's because there are 2
routes of flow. The flow in curcuit B begins two times greater because
it needs to divide equally into the two light bulbs it passes through.
2: d/c is "direct current" (steady voltage) and a/c is
"alternating current" (voltage goes first positive then negative)
3: The different flows of energy within a curcuit. I had no idea
how/why electricity works-- it has been so long. Learning about how/why
an light bulb shines brighter than others was very interesting too.
4: If you stick your finger in an outlet, you get
electricuted..why is this so? Does it have something to do with the
energy flow?
lecture preflight 10
1: I believe that student 1 has a good arguement because whenever
there is more than one bulb, half the current is directed toward each
outlet. Thus, the light emitted from the bulb wuld be less bright for
both of them.
2: A/C stands for an alternating current, and D/C stands for a
direct current. A/C's magnetic property of current is induction. In a
D/C current a magnetic field builds up.
3: I learned that the heat inside a lightbulb is just as hot as
the sun. Additionally, I learned that the oxygen inside light bulbs is
taken out in order to stop chain reaction.
4: I was wondering what substance exactly is used in the filiment
for a light bulb to make it light up so brightly?
lecture preflight 10
1: I agree with student 1. Student 2 is wrong because the
brightness in the bulbs is equal because of equal voltage drop, and not
because of the same current. In circuit A all of the current goes
through the one bulb, while in circuit B the current is divided between
the two bulbs.
2: A/C, standing for alternating current, is when the direction
of the current changes directions quickly while in D/C the current is
continuous.
3: An increase in resistance creates a decrease in current
4: How does a rechargable batter work?
lecture preflight 10
1: I agree with student two because a parallel circuit, which is
the circuit shown in picture B, sprads the electrical current out
evenly. It is not cut in half even though there are two bulbs attached
to it.
2: AC (Alternating Current Electricity), is typically used n
homes and businesses. The current alternates direction and the voltage
can be changed readily. DC (Direct Current Electricity), is continuous
in one direction. It typically flows from a wire and would not be used
in homes.
3: I learned that steel wool can spark and eventually start a
fire when it is placed with wires and a battery.
4: When you make hard boiled eggs, what decides whether the yolk
is all yellow or if it will have a slightly darker outer portion? Like
with Easter eggs, the whole angel/devil scenerio.
lecture preflight 10
1: I agree with student 2 because of the alligator-pool analogy
that Joel told us in class. More electricity will flow through circuit B
because there are two different paths to choose. So, both bulbs burn
just as bright as in circuit A, but there is more flow since two bulbs
are being lit brightly and not just one.
2: A/C stands for alternating current and D/C stands for direct
current. Alternating Current (AC): A type of electrical current in which
the direction of the flow of electrons switches back and forth. In the
US, the current that comes from a wall outlet is alternating; it cycles
back and forth sixty times each second. The current that flows in a
flashlight, on the other hand, is direct current (DC), which does not
alternate. Direct Current (DC): Current which moves in a single
direction in a steady flow. Normal household electricity is alternating
current (AC) which repeatedly reverses its direction. However, many
electronics devices require DC, and therefore must convert the current
into DC before using it.
3: I thought it was very interesting to see that salt water and
baking soda water will conduct electricity, but sugar water and
distilled water will not because they dont have charged particles
floating around in them.
4: How come if you pause a show on a plasma tv and leave it there
paused too long a remainder of the image will stay after you turn the tv
off? so what is a plasma tv made of that makes it different from a
regular tv?
lecture preflight 10
1: I agree with student 1 because the two different pathways
divides up the amount of electricity that is going through it.
2: AC is alternating current, an electrical current whose
magnitude and direction vary cyclically but DC is direct current which
direction remains constant.
3: That it is the oils on your skin that causes you to gives you
and electric shock if by water not the water itself because it would
just short the appliance.
4: How can it be colder inside a room when the temperature
outside is a lot warmer w/o air conditioning or fans?
lecture preflight 10
1: I agree with student 2. Since the bulbs are the same
brightness, we know that they have equal current going through them.
2: A/C stands for alternating current and the current's magnitude
and direction vary cyclically. On the other hand, D/C stands for direct
current whose direction remains constant.
3: That salt water can conduct electricity.
4: What happens to your body when an electrical current is sent
through it (say if you stick your finger in an outlet)?
lecture preflight 10
1: I agree with student 2 because there must be more energy to
light up two lightbulbs that have two different paths (as in situation
b), and therefore shine equally as bright as situation A. However, the
battery will run out faster with situation B.
2: The internet says it has to do with directions the electrons
flow. AC switches directions, while DC electrons usually flow in one
"foward" direction.
3: I learned how to set up a series and parallel circuit.
4: How does the internet work?
lecture preflight 10
1: i think i agree with student B because lets say the battery is
6 volt, both currents have 6 volts in them while the one current in A
has only one 6 volts
2: A/C = alternate source (household electricity) D/C = direct
source (battery)
3: you can use salt waiter as a conductor to light a bulb
4: why does a fuse burn out if the voltages from the battery are
greater than what the bulb can carry, why is the light bulb just not
extra bright?
lecture preflight 10
1: Student 2. The flow must be more in circuit B because the
current is the same in A and B, causing the two light bulbs to be
equally as bright as the bulb in circuit A.
2: A/C is "Alternating Current." D/C is "Direct Current."
Alternating current flows one way and then the other way, constantly
reversing direction. Direct current may increase or decrease, but always
flows the same direction.
3: I learned that electricity flows from the positive end of a
battery to the negative end.
4: How do cellular phones work? To be more specific, how can I
send a message to another person without any cords or wires between the
phones?
lecture preflight 10
1: Neither because the current through each bulb is the same. In
circuit B each light bulb has an independent circuit.
2: A/C is alternating current and D/C is direct current.
3: Circuits and light bulbs produce heat and as a biproduct they
produce light.
4: How do cell phones work?
lecture preflight 10
1: Student 2 because figure B is a parallel circuit which means
that each bulb is running on an individual circuit.
2: A/C is an alternating current and D/C is direct current.
3: How not to burn myself.
4: I really don't understand the essense of fire.
lecture preflight 10
1: I agree with student A He/She does not indicate the
brightness, but it is true that the current through the battery in each
circuit is the same.
2: alternating current (A.C.), direct current (D.C.),
(http://library.thinkquest.org/15433/unit7/7-4.htm)
3: Currents flow better in parallel ciruits than series circuits.
4: Is it true that an apple a day really keeps the doctor away?
lecture preflight 10
1: I agree with student 2 because in the circuit B each circuit
is individual and will be the same brightness because they are both
receiving the same amount of volts from the battery.
2: I asked my roomate what the difference between A/C and D/C
electricity was and she said she has never heard of either!
3: I learned that salt water conducts electricity!
4: How come when we put the electric current in the water we
didnt get electricuted?
lecture preflight 10
1: student 2. Because there's double the amount of current
flowing out of the battery for B.
2: "Alternating current or AC electricity is the type of
electricity commonly used in homes and businesses throughout the world.
While the flow of electrons through a wire in direct current (DC)
electricity is continuous in one direction, the current in AC
electricity alternates in direction. The back-and-forth motion occurs
between 50 and 60 times per second, depending on the electrical system
of the country"
3: salt and baking soda conducts electricity
4: none
lecture preflight 10
1: I agree with student 2 because if there were less of a
current, the bulb would be dimmer.
2: A/C plugs into an outlet while D/C runs on a rechargeable
battery.
3: I did not know that pure water actually does not conduct
electricity.
4: If you are holding an umbrella during a thunderstorm and the
umbrella gets struck by lightning, could rubber gloves save you?
lecture preflight 10
1: Student 1, because there is same total amount of current for
each circuit, meaning in circuit B half of the current is going through
each part of the parallel circuit. Even though the lights appear the
same, the difference in current is major.
2: In A/C the current is constantly changing directions as it
covers distance, while D/C has a direct, constant path for current. A/C
is more efficient for long distances, but it is converted into D/C that
household appliances use.
3: Distilled water is not a conductor.
4: How do Bluetec diesel engines work? (Audi and Mercedes, made
to meet European and California emissions standards)
lecture preflight 10
1: i agree with neither student. all three bulbvs (1 in A, and
the 2 in B) will have the same amount of current running through them,
thus they will have have the same amount of brighness and the same flow
from the battery.
2: alternating current is an electrical current in which the
magnitude and direction vary cyclically whereas direct current's
direction remains constant
3: the reason you get out of a swimming pool when you see
lightening is because the chlorine ion conducts electricity.
4: how does the glaucoma testing machine work?
lecture preflight 10
1: Neither because they both give the wrong argument. Although
they are correct in saying that the current in each circuit is the same
is correct, they fail to realize that the A and B both have the same
brightness in their bulbs because the flow is still the same in both
circuits A and B.
2: A/C stands for alternate current and D/C stands for direct
current.
3: I learned that distilled water is not a very good conductor of
electricity, but that salt and baking soda are because of their charge.
I also thought it was really interesting that even though distilled
water is not a very good conductor, tap water is, because of all of the
stuff in it (minerals, etc.) and that is why you can get electrocuted if
an electrical appliance falls into the tub.
4: What is/where from/why is there static electricity?
lecture preflight 10
1: I agree with student 2 because, as we discussed in class,
there is twice as much current in circuit B as in circuit A.
2: AC (alternating current) electricity current alternates
direction. DC (direct current) electricity current is continuous in one
direction.
3: I thought it was interesting in the last activity where we
used the different solutions to see if they conducted electricity.
4: Why do the backs of post-its become less sticky over time?
lecture preflight 10
1: student 1 because it is correct, student two needs to go to
class more.
2: Alternating current and direct current.
3: Steel wool burns cool if you but a battery to it.
4: Can a can of coke really disolve an entire steak?
lecture preflight 10
1: I agree with B. The brightness is the same, which means that
more power (flow) has to go through the circuit.
2: DC is direct current, which means there are electrons moving
in one direction only. AC stands for alternating current, and an AC
source prodcuts currents that flow in one direction and then the other
continuously cycling through.
3: I learned that baking soda conducted electricity.
4: How does an mp3 player work?
lecture preflight 10
1: I agree with student A. It seems logical that there would be
less current since they are two bulbs split up.
2: Ac electricity is better for providing electricity. In ac
electricity, the current alternates in direction. In Dc electricity the
voltages can not be transformed and thats why we use Ac electricity.
3: Water containing Salt or baking soda can help conduct
electricity.
4: why doesnt water have a specific shape?
lecture preflight 10
1: I agree with student 2 because B is set-up as parallel circuit
so the bulbs are as equally bright as the bulb in A, meaning there is
more flow in circuit B.
2: A/C means alternating current which means the current flows
one way and then the other. D/C is direct current which means the
current always flows in the same direction but it may vary in amount.
3: If you use steel wool as a conductor it starts a fire.
4: Why can humans connect electricty?
lecture preflight 10
1: Student 1 is correct. In circuit A, all of the current must
move through it. In B, it has a choice, so it will be split evenly
between the two lights.
2: A/C...alternating current. Switches 60 times a second.
Lightbulbs and outlets in houses. D/C- Direct current. Things with
batteries. Current goes one way...not both.
3: I didn't know that pencil led would conduct electricity.
4: When you split a grape in two and put the two pieces side by
side in a microwave, why do they spark?
lecture preflight 10
1: Student 1 is wrong because B has the same amount of brightness
in each bulb since it's a parallel circuit. Student 2 is correct because
the bulbs all have the same current running through them. However, the
flow through the battery in circuit B is not more than circuit A.
2: A/C or alternating current allows electricity to travel far
distances without losing much power. A/C voltage can be changed and it
also alternates direction. It is most frequently used to power our home
appliances, etc. D/C or direct current only allows electricity to travel
a short distance before it loses power.
3: Pencil lead and salt water conduct electricity but distilled
water doesn't.
4: What minerals in tap water allow conduction of electricity?
lecture preflight 10
1: Neither: B has two independent versions circuits, both with
currents that are equally strong and not dividued in half. The flow is
the same in A and B, only the current in some places in B is twice as
strong.
2: A/C electricity is used for sockets in the house, phones,
radio, television. The flow of electrons in D/C electricity is
continuous in one directions. The flow of electrons in A/C electricity
alternates in direction.
3: Solutions like salt can actually conduct electricity.
4: What solution is the best conductor of electricity and why?
And is it also the best conductor of heat?
lecture preflight 10
1: Neither, because when the bulbs are connected in parallel they
both have the same brightness. Even though the electricity splits, the
same original amount eventually comes back in.
2: A/C stands for alternating current and D/C stands for direct
current.
3: Salt water conducts electricity.
4: Could certain kinds of tap water (for example, well water) be
conductors of electricity?
lecture preflight 10
1: student 2
2: DC- battery, current goes in one direction. AC- current
switches direction many times per minute.
3: how to burn up a light bulb
4: can someone chug a gallon of milk without throwing up?
lecture preflight 10
1: I agree with Student B, because all of the light bulbs in
either A or B will have the same brightness. This is because the current
flowing through the light bulbs and the resistance from the light bulbs
is the same. In circuit B, more electricity is being used because both
of bulbs are glowing at say about 5, whereas in circuit A only one bulb
is glowing at 5.
2: A/C stands for alternating current and D/C stands for direct
current. In an alternating current, the magnitude and direction of the
current change cyclically, whereas in a direct current, the direction
remains constant.
3: I learned that electricity always flows from positive to
negative but there was no way for me to actually see that happening.
4: How does the weather change so drastically so quickly?
lecture preflight 10
1: I agree with student one because the voltage and resistance
are the same so only the current changes due to V=IR.
2: DC stands for direct current and it is the constant flow of
electrons in a single direction. AC stands for alternating current and
it is an electrical current whose magnitude and direction vary
cyclically. wikipedia.org
3: Christmas lights were originally in a series circuit but now
they make them in a parallel so the whole stand does not go out if one
light burns out.
4: How do fluorescent lights work?
lecture preflight 10
1: i agree with student 1- because there is the same current
going through both a and b, but because b has two bulds to light up the
bulbs will split the total voltage therefore they will be less bright
individual when compared to bulb a.
2: A battery cell gives "D.C." or "direct current" which gives a
steady voltage to make a radio work. "A.C." stands for "alternating
current". The wiring in your house or apartment is AC and all the wiring
on the poles outside is AC.
3: i learned that salt water and baking soda were good
conductors, but sugar is not.
4: why does hair turn gray?
lecture preflight 10
1: I think that both are slightly off. The current through the
battery in each circuit is the same in both A and B. B is a parallel
circuit and each bulb acts independently, thus recieving its full
voltage from the battery. That's why the bulbs light up with the same
brightness in both circuits. Each bulb gets its equal amount of voltage.
2: A/C is alternating current and D/C direct current. Alternating
current is an electric current that reverses direction in a circuit at
regular intervals. Direct current is an electric current flowing in one
direction only.
3: The difference between parallel and series current. It makes
sense that in a parallel current the voltage is transmitted to both
bulbs equally.
4: Why do certain fabrics have that when exposed to heat in the
dryer, some shrink more than others?
lecture preflight 10
1: Student 1 because electrons choose their paths. The flow is
the same in both circuits.
2: Electricity flows in two ways; either in alternating current
or AC and in direct current or DC. The word electricity comes from the
fact that current is nothing more than moving electrons along a
conductor, like a wire, that have been harnessed for energy. Therefore,
the difference between AC and DC has to do with the direction in which
the electrons flow. In DC, the electrons flow steadily in a single
direction, or "forward." In AC, electrons keep switching directions,
sometimes going "forwards" and then going "backwards." The power that
comes from our wall outlets is AC, the more common, efficient kind.
3: Pencils can conduct electricity!
4: nothing this week =(
lecture preflight 10
1: Student 1 because in circuit B the current has two paths that
it can follow and so it can split up and in circuit A there is only one
path for the current to follow.
2: Alternate current and Direct current. I don't know what
exactly the difference is but I guess we will find out in lecture.
3: Pencil is an average conductor of electricity
4: How are Christmas lights set up? Is it a series or a parallel
circuit or a combination of both?
lecture preflight 10
1: I agree with student 1. The current is the same, however the
the bulbs in circuit B will be slightly dimmer than the one in circuit
A.
2: A/C stands for alternating current, while D/C stands for
direct current. The flow of electrons in D/C goes in one direction only,
while in A/C it can flow in more than one direction.
3: Even though it can be very dangerous to drop an electrical
item in water, water alone does not conduct electricity.
4: What exactly is a calorie?
lecture preflight 10
1: I agree with Student 1 because in parallel circuits the
circuit is the same. Although the flow is divided in circuit B, it
eventually regroups and reaches the battery with the same circuit power
as it started.
2: DC stands for a direct current where the direction of flow
from the current always goes in one direction. AC stands for alternating
current where the direction of flow alternates its directions.
3: I learned how to connect a light bulb to a battery and
alligator clips and turn the light bulb on.
4: Why do the sidewalks crack at certain points in the year?
lecture preflight 10
1: I agree with student 1 because the current is going to be the
same that runs to the bulbs, but the bulbs in B will be dimmer than that
in A because the current has to be split between the two bulbs.
2: The flow of electrons through a wire in direct current (DC)
electricity is continuous in one direction, and the current in AC
electricity alternates in direction.AC is created by an AC electric
generator, which determines the frequency. What is special about AC
electricity is that the voltage in it can be readily changed, thus
making it more suitable for long-distance transmission than DC
electricity.
3: I learned that two bulbs connected to one current will be
dimmer than if one bulb is connected to that current.
4: How does temperature affect the sound of a musical instrument?
lecture preflight 10
1: I do not agree with student one at all because the bulbs in B
will both be the same brightness. I partly agree with students two
because she explains that both the bulbs in the circuit will have the
same brightness; however, I think that there are 2 currents with the
same voltage going through the bulbs. If you remove one of the lights it
would not effect the other in this parallel circuit.
2: According to
http://www.bbc.co.uk/scotland/education/bitesize/standard/other/sos/physics/electricity/answerelectricity_81.shtml,
The abbreviation a.c. stands for alternating current and d.c. stands for
direct current. As the descriptions suggest, alternating current is
current in which the electrons flow in one direction for a time and then
they flow in the other direction and so on ie the current alternates.
Direct current is current in which the electrons flow in one direction.
Alternating current is provided by the mains supply. Direct current is
supplied by a battery.
3: I learned that electricity can flow in liquids such as salt
water and backing soda.
4: How do cell phones and text messaging actually work? How does
the person you are sending a message to actually recieve it?
lecture preflight 10
1: I don't agree with either student because student 1 is wrong
in saying that each bulb has half the current of circuit B and student 2
is wrong in saying that the flow in circuit B is more than A. The
voltage is the same and the resistance is the same so the currents are
the same.
2: A/C is alternating current, meaning the current changes
constantly, flowing left once and then right once. D/C is direct
current, meaning it always flows one direction, ie from positive to
negative
3: I was reminded of all the things I learned in high school
about electricity and current.
4: Why do blood vessels explode?
lecture preflight 10
1: Neither. The flow of current and the brightness of the bulbs
are the same in A and B.
2: A/C=Alternating current D/C=Direct current ...courtesey of my
roommate :)
3: I have done this lab in another science class for elementary
teachers, but I learned more about currents and how they relate to the
brightness of the bulbs.
4: How can the polarity of a microfilament be demonstrated
experimentally? a) by adding a fragment containing the myosin tail
domain and visualizing by electron microscopy b) by treating cells with
fluorescent phalloidin and visualizing by electron microscopy c) by
polymerizing green fluorescent actin monomers in the presence of green
fluorescent phalloidin-labeled filaments d) by adding a protein fragment
containing the myosin head domain and visualizing by electron microscopy
e) both c and d are correct Ok, I can't lie, I got this off of my
roommate's MCB exam, but it is interesting none-the-less ;)
lecture preflight 10
1: Neither, the current through circuit B is larger. This is true
because the current still only hast o go through one bulb but it can go
through either. Therefore the current is larger in circuit B.
2: A/C is alternating current electricity and D/C is direct
current electricity. D/C electricity is the continuous movement of
electrons from an area of negative (-) charges to an area of positive
(+) charges through a conducting material such as a metal wire. A/C
electricity alternates in direction.
3: I learned that they wire gets hot if the ends of it are
connected to both ends of the battery.
4: Why do cans of pop sometimes explode when they freeze?
lecture preflight 10
1: i agree with the second student because we said that
brightness is determined by current.. more current=brighter.. so if all
bulbs have the same brightness then there should be the same current
going through them.
2: D/C means direct current and A/C means alternate current. with
a D/C it is not possible to use a transformer to change voltage. A/C
also provides advantages in the designs of motors and generators
3: pencil lead (graphite) is a conductor
4: our group was confused as to why the light bulb didn't go off
when we put each of the ends on ourselves..if we're not conductors why
can we get struck by lightening
lecture preflight 10
1: Neither. I almost agree with student 2, but the current going
through them both is the same.
2: A/C stands for alternating current and D/C stands for direct
current. The flow of electrons in A/C electricity sometimes changes
directions, but D/C electricity means that the electrons stay flowing in
the same direction.
3: I learned how lightbulbs work.
4: How does a computer send things to a printer and print them
out so fast?
lecture preflight 10
1: I agree with student 1 because current always remains the
same. It never gets used up or taken away therefore, the amount of total
current in the battery in each circuit is the same, however, the current
is divided between the 2 bulbs in circuit B since it is parallel.
2: A/C electricity is alternating current and is the most often
used in homes. DC electricity provides direct current and is continuous
in one direction while AC electricity alternates in direction.
3: I learned that baking soda conducts electricity.
4: I was wondering why lead pencil did not conduct electricity?
lecture preflight 10
1: I agree with student 1. This is because the current flowing
through the battery in each of the circuits has to be the same. The only
difference is the current flowing through the bulbs in circuit A and
circuit B. Circuit A has the same current flowing through the bulb as
the battery because they are in series. In B, the current is divided
according to resistance among all parallel components. The more
resistance the component has, the less current it shall receive.
2: A D/C electricity or Direct current electricity involves
current flowing in one direction. In A/C electricity or Alternating
current electricity, the voltage alternates in a sine wave pattern
instead of just the constant voltage as in the case of A/C circuit.
3: I thought it was really interesting to see how baking soda
acted as a conductor. I thought the bulb would not light up in baking
soda because because it is more of a basic solution when mixed with
water.
4: How do they time the tiny bulbs in christmas lights that blink
on and off continously?
lecture preflight 10
1: I agree with Student 1. The battery provides the same amount
of current, which is divided between the two bulbs.
2: D/C electricity is direct current electricity and can only
carry the electric current a minimal distance, but A/C, or alternating
current, can carry the electric current much further.
3: I learned that salt water can be light conductor.
4:
lecture preflight 10
1: neither. i think they would both be about the same (circuits a
and b) if not b has to split the electricity between the 2 bulbs so it
would be less
2: a/c electricity stands for alternating current while d/c
stands for direct current.
3: distilled water does not conduct electricity but salt water
will
4: how much electricity does lightening have?
lecture preflight 10
1: Neither. The light bulbs will be the same brightness in both A
and B, but the current is not the same in both.
2: A/C is alternating current and D/C is direct current. D/C has
an offset which A/C doesn't (centered at 0)
3: The graphite in a pencil conducts electricity.
4: How can it be so warm, get so cold so quickly, and then
everyone gets sick?
lecture preflight 10
1: Student two because the current passes through both at the
same time and meets at the end to flow back to the beginning.
2: A/C stands for alternating current and D/C stands for direct
current.
3: Salt water conducts electricity.
4: How/when/will the sun burn out?
lecture preflight 10
1: student 2; the current is the same everywhere, regardless of
how many bulbs there are.
2: a/c is alternating circuit and d/c is direct curcuit. i found
this site that explains it all but i still dont understand...
http://www.satcure-focus.com/tutor/page1.htm
3: i knew nothing about circuits!
4: why does gravity work? what is actually pulling us? why does
the earth have gravity?
lecture preflight 10
1: I agree with neither of the students. Student one was correct
in that they said that the current through each of the circuits is the
same and the flow is the same. Student B is wrong in that they say that
the flow through battery in circuit B is more. I think that the current
and flow through each battery of each circuit is the same. The bulbs
will also be of equal brightness because they each are receiving the
same amount of flow because they all are part of a closed circuit.
2: A/C is alternating current and D/C is direct current. Direct
current means that you are receiving a steady flow of voltage in one
direction to whatever object you are using. Alternating current goes in
alternating directions. The voltage can also be changed, thus it works
better for long distances.
3: I learned the water pipe analogy of currents and electricity
which helped me to better understand resistence.
4: How do heaters work?
lecture preflight 10
1: I agree with student number 1. The circuit is the same but it
is simply divided to be able to supply the two lightbulbs with the same
amoung of energy. However, the first circuit( A) will shine brighter
since it is the only light bulb in the series.
2: A/C stands for alternating current while D/C stands for direct
current. What this means is that A/C has no specific temperature while
D/C has to function at a specific in order to function as smoothly as it
should. This affects the distance of how long the electricity can flow
without loosing energy. When comparing these two AC is used to further
and stronger currents while DC is used for things that might need less
energy to function.
3: One intresting thing that I leaned in lab this week is that a
distilled water is not as good as a condutor of electricity as tap
water.
4: How do DVD players work?
lecture preflight 10
1: Neither. B would shine brighter but not because the flow
through the battery in circut B is more than through the battery in
circut A, but because it is the same.
2: A/C stands for alternating current and D/C stands for direct
current.
3: I learned what conducts electricity well and what doesn't.
4: How do scientists find the calories of a food?
lecture preflight 10
1: student B because like joel said the flow of traffic would be
lighter and there would be more options to reroute, with no traffic jam.
2: well i have no clue! i tied looking it up and it only gave me
ways to monitor it.... BUT my brother told me that the electric slide is
a great way to demo electricity.
3: salt conducts energy! and the pool connection(chlorine being a
good condutor also) !
4: IS the electric slide is it really a good representation for
the way electricity work? maybe we should have class participation to
dance.... MATS YOU BRING THE MUSIC! "how many wood chuck can a wood
chuck chew if a wood chuck could chuck wood?" where did this silly thing
come from??
lecture preflight 10
1: Student 2 is correct becuase B passes twice as much current as
A to reach both batteries.
2: A/C is an alternating current, while D/C is a direct current.
3: I learned the difference between a series and a parrel
circuit.
4: Why do plugs sometimes spark when you plug things in??
lecture preflight 10
1: I agree with neither. The flow of the current is the same in
both circuits. This is evident because all of the bulbs in this circuit
will light up with the same brightness.
2: A/C (alternating current) electricity flows one way and then
the other way, continually alternating its flow. A/C electricity can be
distributed much farther thatn D/C electricity. D/C (direct current)
electricity always flows in the same direction. It is always positive or
always negative unlike A/C electricity that can change between the two.
3: Sugar is not a good conducter.
4: How does a police radar gun work?
lecture preflight 10
1: Student 2 because although the energy is split there just
needs to be more power supplied to circuit B (the battery will die
quicker) but the same brightness will show.
2: DC - direct current means electrons only move in one
direction. Where as AC - alternating current where currents flow in more
than one direction.
3: The analogy of water and electricy helped me to understand how
current flows and how the battery plays into the electical circuit.
4: How do halogen light bulbs work as opposed to "regular" light
bulbs?
lecture preflight 10
1: I agree with student 1. The current from the battery is
divided up between the two bulbs to equal the total amount as if there
was only one bulb.
2: Alternating current (AC) is an electrical current whose
magnitude and direction can change. Direct current (DC) is an electrical
current whose direction remains the constant.
3: I thought it was interesting that the distilled water was not
a conductor of electricity but the salt water was.
4: My friend was saying that his football coach use to recommend
eating bananas. Why?
lecture preflight 10
1: I agree with student B, because the current is not divided in
hald in B, because the light bulbs are not on the same pathway.
2: Alternating current or AC electricity is the type of
electricity commonly used in homes and businesses throughout the world.
While the flow of electrons through a wire in direct current (DC)
electricity is continuous in one direction, the current in AC
electricity alternates in direction.
3: I learned that pencil lead is a good conductor of electricity.
4: How does snow form?
lecture preflight 10
1: I agree with Student 2 because circuit B is a parallel
circuit. Parallel circuits are made of two indentical, independent
cicruits that have the same amount of electric current through them.
2: D/C is a direct current in which electricity is flowing in a
constant direction and has a voltage of constant polarity (like a
battery with definite +/- terminals). A/C stands for alternating
current. These electrical sources naturally produce alternating voltage
poles and reverse over time. Currents can also switch back and forth as
well.
3: I learned that baking soda and salt can conduct electricity.
4: How do fireworks work?