Name: ________________________ Class: ___________________ Date: __________ ID: Z
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 1. You wish to measure a current through a resistor. You should connect the measuring device in what way?
a.
in series with the resistor b.
in parallel with the resistor c.
replace the resistor with the measuring device d.
it depends on the circuit
____ 2. A current of 20 A flows through a wire of length 1 m and diameter 1 mm. The potential across the wire is
1.4 V. From this table of resistivities, select the material of the wire:
Material
Copper
Silver
Gold
Tungsten
Iron
Resistivity(Ohm-m)
1.7x10
-8
1.59x10
-8
2.44x10
-8
5.5x10
-8
10.0x10
-8 a.
Copper b.
Silver c.
Gold d.
e.
Tungsten
Iron
____ 3. A 3 V potential difference is maintained across a 10 Ω resistor for 2 minutes. How many electrons pass through the material?
a.
2.25x10
20 b.
60 c.
3.75x10
18 d.
0.3
e.
36
____ 4. Nonohmic materials a.
b.
all of the above do not include most resistors c.
do not obey Ohm’s Law d.
include diodes
____ 5. A one-hundred watt lightbulb and a 50-watt lightbulb are in parallel with a power supply of 100 V. What current flows through the 100 W light bulb?
a.
1/2 A b.
2 A c.
None of the above d.
1 A
____ 6. A 50 Ω and a 100 Ω resistor are in series with a power supply of 150 V. What amount of energy is dissipated across the 50 Ω resistor in 3 seconds? a.
300 J c.
450 J b.
100 J d.
150 J
1

Name: ________________________ ID: Z
____ 7. The electric company charges a rate of $0.10 per kilowatt-hour. How much does it cost to run a 100 W bulb for 10 hours? a.
$1 b.
$10 c.
$0.36
d.
$0.10
____ 8. On a circuit breaker, you have a 1200 W heater, a 60 W light bulb, and a 240 W radio. When you add a 180
W blender, the circuit breaker turns off. Assume all the devices operate at 120 V. Which of these is the maximum allowed current for the breaker?
a.
20 A b.
13 A c.
10 A d.
15 A
____ 9. Two wires, A and B , are made of the same metal and have equal length, but the resistance of wire A is 16 times the resistance of wire B . How do their diameters compare?
a.
b.
d d
A
=d
B
A
=2d
B d.
d
A
=4d
B e.
d
A
=
1
2 d
B c.
d
A
=
1
4 d
B
____ 10. When you rotate the knob of a light dimmer, what is being changed in the electric circuit?
a.
resistance b.
current c.
power d.
e.
just power & current all of the above
____ 11. In your house, two lightbulbs operate at 120 V, but one has a power rating of 25 W while the other has a power rating of 100 W. Which one has the greater current flowing through it? a.
25 W bulb b.
not enough information c.
d.
both have same current
100 W bulb
____ 12. Two space heaters in your living room are operated at 120 V. Heater 1 has twice the resistance of heater 2.
Which one will give off more heat?
a.
Heater 1 b.
Heater 2 c.
both will give same heat d.
not enough information
2

Name: ________________________ ID: Z
____ 13. A battery has an internal resistance of 1 Ω . When it provides a current of 2 A, the potential across the battery is 10 V. What is the ideal electromotive force provided by the battery?
a.
5 V b.
12 V
____ 14. What is the equivalent resistance of this circuit?
c.
30 V d.
20 V a.
5.6 Ω b.
25 Ω c.
d.
5.1
4.1
Ω
Ω
____ 15. Two resistors of 7 Ω and 3 Ω are in series with a 10 V battery. What is the current through the 3 Ω resistor?
a.
3.33 A b.
1 A c.
d.
3
1.4 A
0.3 A

Name: ________________________ ID: Z
____ 16. Three resistors of 2 Ω , 4 Ω , and 4 Ω are in parallel with a power supply of 10 V. What is the total current through the circuit? a.
2.5 A b.
5 A c.
d.
10 A
1 A
____ 17. The ammeter in this circuit reads a current of I
3
=1 A. What is the current I
1
?
a.
1.1 A b.
1.25 A c.
1.4 A d.
2.9 A
4

Name: ________________________
____ 18. Which of these equations is appropriate (ie. correct) for this circuit?
ID: Z a.
10-6I
2
-2I
3
=0 b.
I
1
+I
3
=I
2 c.
2I
3
+6I
1
-10=0 d.
14+6I
1
-10-4I
2
=0 e.
14-4I
2
+2I
3
=0
5

Name: ________________________
____ 19. In this circuit, what happens to the current in each resistor as you add resistors in parallel?
ID: Z a.
Current decreases b.
Current stays the same c.
It depends on the value of the added resistance d.
Current increases
____ 20. In this circuit, what happens to the brightness of bulb A when you close the switch?
a.
not enough information b.
glows brighter than before c.
glows just the same as before d.
glows less than before
6

Name: ________________________ ID: Z
____ 21. In this figure, light bulbs A, B, and C each have a resistance of 1 Ω . How do the brightness of bulbs A and C compare?
a.
bulb A is four times as bright as C b.
bulb A is twice as bright as C c.
bulb A is 1/2 as bright as C d.
bulb A is the same brightness as C e.
bulb A is 1/4 as bright as C
____ 22. When 2 or more resistors are connected in parallel to a battery, a.
all of the above c.
the equivalent resistance of the combination is less than or equal to the resistance of any one of the resistors b.
the voltage across each resistor is the same d.
the total current flowing from the battery equals the sum of the currents flowing through each resistor
____ 23. Three identical resistors are connected in series to an ideal battery with V=12 V. What is the potential across each resistor?
a.
4 V b.
2 V c.
3 V d.
6 V
7

Name: ________________________ ID: Z
____ 24. In this RC circuit, the time constant is 1 µs and the resistance is 10 Ω. What is the capacitance, C?
a.
2 µ F b.
0.1 µ C c.
10 µ F d.
1 µ F e.
0.1 µ F
____ 25. What happens to the voltage across the resistor R
1
when the switch is closed? The voltage will: a.
decrease b.
increase c.
stay the same d.
not enough information given
8

Name: ________________________
____ 26. What happens to the current through the resistor R
1
when the switch S is closed?
ID: Z a.
decreases b.
increases c.
stays the same
____ 27. Assume each of these resistances are identical. Which resistor(s) has the least amount of current flowing through it?
____ 28. a.
R
5 b.
both R
3
and R
4
equally c.
both R
1
and R
2
equally d.
R
1 e.
all the same
What purpose does the third prong on a three-prong outlet serve?
a.
Allow for more stability in the outlet c.
Act as a ground thus providing a safety feature b.
An alternative to the European system of electrical outlets d.
No purpose
____ 29. GFCI stands for a.
Gauge for Circuit Integrity b.
Ground Force Circuit Interpreter c.
Good For Cashing In d.
Ground Fault Circuit Interrupt
____ 30. A household circuit has all of the electrical devices connected in _____________.
a.
it depends on the house c.
series b.
parallel d.
a combination of series and parallel
____ 31. The correct answer to this question is “A.” Please write “A” above your name on the scantron.
a.
A c.
C b.
B d.
D
9

MULTIPLE CHOICE
1. ANS: A
2. ANS: D
3. ANS: A
4. ANS: A
5. ANS: D
6. ANS: D
7. ANS: D
8. ANS: B
9. ANS: C
10. ANS: E
11. ANS: D
12. ANS: B
13. ANS: B
14. ANS: C
15. ANS: B
16. ANS: C
17. ANS: C
18. ANS: C
19. ANS: B
20. ANS: B
21. ANS: A
22. ANS: A
23. ANS: A
24. ANS: E
25. ANS: B
26. ANS: B
27. ANS: B
28. ANS: C
29. ANS: D
30. ANS: B
31. ANS: A
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
PTS: 1
1
ID: Z