Download Test on Electricity 2010 - version B Burns CP Physics

Name: __________________________
Test on Electricity 2010 - version B
Period _____
Burns
Date: ________
CP Physics
Multiple Choice: Identify the choice that best completes the statement or answers the question. Fill in the
corresponding oval on your Scantron sheet.
1. Materials whose resistance changes when voltage varies are called:
a
b
c
d
e
ohmic.
inohmic.
nonohmic.
deohmic.
ohmless.
2. If the voltage across an ohmic resistor is doubled, what happens to the current through it?
a
b
c
d
e
It doubles.
It quadruples.
It halves
It is quartered.
It depends on the resistance.
3. If R1 < R2 < R3, and if these resistors are connected in series in a circuit, which one has the highest voltage?
a
b
c
d
e
R1
R2
R3
All are equal in voltage.
More information is needed.
4. How is current in a light bulb measured?
a
A voltmeter is placed in series with the light bulb.
b
A voltmeter is placed in parallel with the light bulb.
c
An ammeter is placed in series with the light bulb.
d
An ammeter is placed in parallel with the light bulb.
5.Which of the following will successfully light the bulb?
a
d
b
e
c
6. What are the charges shown in the electric field line diagram above?
a
G, H and I are all negative.
b
G and I are negative and H is positive.
c
G and I are positive and H is negative.
d
G, H, and I are all positive.
7. What are the relative magnitudes of the charges in the diagram above?
a
c
G>H>I
G>I>H
b
d
G=H=I
H>G>I
8.
Which of the schematic diagrams represents this realistic drawing of a circuit?
a
c
b
d
Use this chart to decode resistors:
9. What is the resistance of a coded resistor with the bands: gray - violet - yellow.
a
c
87 
87400 
b
d
874 
870000 
For questions #10-11: Three identical light bulbs are connected to a battery as shown below. W,
X,Y and Z represent locations along the circuit.
10. Refer to above diagram. Which adjustments could be made to the circuit that would increase the current
being measured at X?
a
Increase the resistance of one of the bulbs.
b
Increase the resistance of two of the bulbs.
c
Decrease the voltage of the battery.
d
Increase the voltage of the battery.
e
Remove one of the bulbs.
11. Refer to above diagram. Which one of the following statements is true?
a
All three bulbs will have the same brightness.
b
The bulb between X and Y will be the brightest.
c
The bulb between Y and Z will be the brightest.
d
The bulb between Z and the battery will be the brightest.
12. Two charged particles held near each other are released. As they move, the acceleration of each decreases.
Therefore, the particles have
a
opposite signs.
b
the same sign.
c
charges that can not be determined.
13. In order to form an electric circuit, you need to have
a
b
c
d
e
wires or conductors to connect everything.
a power source.
a light bulb or some resistance.
a complete path for the current.
all of the above
14. When resistors are put in series next to each other, their overall resistance is
a
b
c
the same as the resistance of one of the resistors.
larger than the resistance of any individual resistor.
smaller than the resistance of any of the resistors.
15.When one light bulb in a series circuit containing several light bulbs burns out
a
b
c
none of the other bulbs will light up.
nothing changes in the rest of the circuit.
the other light bulbs burn brighter.
16. Two lamps, one with a thick filament and one with a thin filament, are connected in series to a battery. The
voltage is greater across the lamp with the
a
thin filament.
b
thick filament.
c
Voltage is the same for both.
17. In a good insulator, electrons are usually
a
b
c
d
e
not moving at all.
free to move around after an impurity has been added.
free to move around.
tightly bound in place.
semi-free to move around.
18. Electrical resistance in a wire depends on the wire's
a
b
c
d
e
thickness.
resistivity.
length.
all of the above
none of the above
19. Electrical potential energy is the energy a charged object has because of its
a
b
c
d
e
momentum.
location.
mass.
motion.
volume.
20. Coulomb's law says that the force between any two charges depends
a
b
c
d
directly on the size of the charges.
inversely on the square of the distance between the charges.
both A and B
none of the above
Problem
1. Draw the continuous conducting path that will enable all 3 light bulbs to light. Be sure to trace the CCP
through the bulbs and batteries.
2. Which bulbs will light? Trace the CCP through the bulbs.
Bulb 1: Lit or Unlit
Bulb 2: Lit or Unlit
3. Use the above circuit to answer the following questions. You may find it easier to make a VIR table to
organize your work. Don’t forget UNITS!
a.
What is the equivalent resistance of the circuit? Put another way: how much total resistance
does the battery have to push through?
b.
What is the current through the battery?
c.
What is the current through R1?
d.
What is the current through R2?
e.
What is the current through R3?
f.
What is the voltage across R1?
g.
What is the voltage across R2?
h.
What is the voltage across R3?
4.
4 amperes flow through a 12-ohm resistor.
a) How much voltage is required?
b) How much power is dissipated?
c) How much energy is used up in 1 day? (Put your answer in kWh.)
d) What is the total cost for a day of use if PSE&G charges 10 cents per kWh?
5. Two identical spheres each carry a charge of 40.0 µC. The spheres are separated by 1.20 m.
a) What is the electric force between them?
b) Is the force attractive or repulsive?
c) In order to have a force 1/4th as large, would you move the charges closer together or farther apart?