1. The diagram below represents an electric circuit consisting
of a 12-volt battery, a 3.0-ohm resistor, R1, and a variable
resistor, R2.
At what value must the variable resistor be set to produce a
current of 1.0 ampere through R1?
3. What is the total resistance of the circuit?
1)
6.6 Ω
2)
10 Ω
3)
20 Ω
4)
30 Ω
4. Three resistors of 20. ohms, 30. ohms, and 60. ohms,
respectively, are connected in series with a battery. A
current of 2.0 amperes will flow through this circuit when
the potential difference of the battery is
1)
6.0 Þ
1)
10. V
2)
9.0 Þ
2)
20. V
3)
3.0 Þ
3)
110 V
4)
12 Þ
4)
220 V
Base your answers to questions 2 and 3 on the diagram below.
5. The diagram below represents a series circuit containing
three resistors.
2. Compared to the current in R1, the current in R2 is
What is the current through resistor R2?
1)
less
2)
greater
3)
the same
1)
1.0 A
2)
0.33 A
3)
3.0 A
4)
9.0 A
6. The diagram below shows three resistors, R1, R2, and R3,
connected to a 12-volt battery.
If voltmeter V1 reads 3 volts and voltmeter V2 reads 4 volts,
what is the potential drop across resistor R3?
1)
12 V
2)
5V
3)
0V
4)
4V
Base your answers to questions 8 through 10 on the diagram
below. The reading of voltmeter V1 is 26 volts, and the reading of
ammeter A1 is 2 amperes.
8. If additional resistances are added in series and the applied
voltage is kept constant, the reading of voltmeter V3 will
1)
decrease
2)
increase
3)
remain the same
9. What is the total resistance of the circuit?
7. Base your answer to the following question on the circuit
diagram below.
1)
3/4 Ω
2)
4/3 Ω
3)
10 Ω
4)
13 Ω
10. What is the reading of voltmeter V2?
The current through R1 will be
1)
52 V
1)
less than 2 amperes
2)
26 V
2)
2 amperes
3)
13 V
3)
more than 4 amperes
4)
8V
4)
4 amperes
11. A 6.0-ohm lamp requires 0.25 ampere of current to operate.
In which circuit below would the lamp operate correctly
when switch S is closed?
1)
2)
13. A 5-ohm and a 10-ohm resistor are connected in series. The
current in the 5-ohm resistor is 2 amperes. The current in
the 10-ohm resistor is
1)
1A
2)
2A
3)
0.5 A
4)
8A
14. A student needs a 4-ohm resistor to complete a circuit. Only
a large quantity of 1-ohm resistors are available. Which of
the following should be done to complete the circuit?
3)
4)
1)
Connect four 1-ohm resistors in series.
2)
Connect four 1-ohm resistors in parallel.
3)
Connect two of the 1-ohm resistors in series and two in
parallel.
4)
Connect only two 1-ohm resistors in parallel.
15. The diagram below represents an electric circuit.
12. In the circuit shown below, how many coulombs of charge
will pass through resistor R in 2.0 seconds?
If the voltage between A and B is 10 volts, the voltage
between B and C is
1)
36 C
2)
6.0 C
3)
3.0 C
4)
4.0 C
1)
5V
2)
10 V
3)
15 V
4)
20 V
16. Two resistors are connected to a source of voltage as shown
in the diagram below.
At which position should an ammeter be placed to measure
the current passing only through resistor R1?
1)
2)
18. What quantities may be directly measured by the
arrangement of meters shown in the diagram below?
1)
voltage drop across R2 and current through R2
2)
current through R1 and R2
3)
current through R1 and voltage drop across R2
4)
the resistance of Rl and R2
1
2
3)
3
4)
4
17. Compared to the resistance of the circuit being measured,
the internal resistance of a voltmeter is designed to be very
high so that the meter will draw
1)
no current from the circuit
2)
little current from the circuit
3)
most of the current from the circuit
4)
all the current from the circuit
19. Base your answer to the following question on the diagram
below which represents two resistances (R1 and R2) and an
ammeter connected to a constant 30. volt source. The
combined resistance of the circuit is 6.0 ohms.
If the resistance of R2 were increased, the current through
R2 would
1)
decrease
2)
increase
3)
remain the same
20. Which diagram shows correct current direction in a segment of an electric circuit?
1)
21. The diagram to the right
represents a segment of a
circuit. The current in wire
X may be
1)
1A
2)
2A
3)
3A
4)
4A
3)
2)
4)
23. The magnitude of the current in ammeter A1 is
1)
120 A
2)
2.0 A
3)
1.2 A
4)
0.83 A
24. Base your answer to the following question on the diagram
below.
Base your answers to questions 22 and 23 on the diagram below
which represents an electrical circuit.
If a third resistance is added in parallel to the 24-volt
source, the combined resistance of the circuit will
22. Compared to the current in A1, the current in A2 is
1)
less
2)
greater
3)
the same
1)
decrease
2)
increase
3)
remain the same
25. The diagram below shows electric currents in conductors
that meet at junction P.
27. The current in R1 is
1)
0.83 A
2)
1.5 A
3)
3.0 A
4)
1.2 A
28. Base your answer to the following question on the diagram
below which represents an electrical circuit.
What are the magnitude and direction of the current in
conductor PQ?
1)
9 A toward P
2)
9 A toward Q
3)
5 A toward P
4)
5 A toward Q
Base your answers to questions 26 and 27 on the diagram below
which represents three resistors connected in parallel across a 24volt source. The ammeter reads 3.0 amperes.
The equivalent resistance of R1, R2, and R3 is approximately
1)
10 Ω
2)
2Ω
3)
20 Ω
4)
7Ω
29. The total resistance of several resistors connected in
parallel is
26. The equivalent resistance in the circuit is
1)
0.13 Ω
2)
8.0 Ω
3)
58 Ω
4)
72 Ω
1)
equal to the sum of the separate resistances
2)
equal to the largest resistance
3)
smaller than the smallest resistance
4)
greater than the largest resistance
30. Base your answer to the following question on the diagram below, which represents an electric circuit consisting of four resistors and a 12volt battery.
What is the equivalent resistance of this circuit?
1) 72 Þ
2) 18 Þ
3) 3.0 Þ
4) 0.33 Þ
31. If a 15-ohm resistor is connected in parallel with a 30.-ohm
resistor, the equivalent resistance is
1)
15 ohm
2)
2.0 ohm
3)
10. ohm
4)
45 ohm
32. Base your answer to the following question on the diagram
below, which shows two resistors and three ammeters
connected to a voltage source.
What is the current reading of ammeter A1 ?
1)
10.0 A
2)
6.0 A
3)
3.0 A
4)
4.0 A
33. A physics student is given three 12-ohm resistors with
instructions to create the circuit that would have the lowest
possible resistance. The correct circuit would be a
1)
series circuit with an equivalent resistance of 36 Þ?
2)
series circuit with an equivalent resistance of 4.0 Þ?
3)
parallel circuit with an equivalent resistance of 36 Þ?
4)
parallel circuit with an equivalent resistance of 4.0 Þ?
Base your answers to questions 34 and 35 on the electric circuit
below. The switch is in the open position.
36. Base your answer to the following question on the diagram
of the circuit below.
If resistance R2 were removed, the current in ammeter A
would
1)
decrease
2)
increase
3)
remain the same
37. Base your answer to the following question on the diagram
below.
34. Compared to the current passing through ammeter A1 when
the switch is open, the current passing through ammeter A1
when the switch is closed will be
1)
less
2)
greater
3)
the same
35. What is the reading of ammeter A1?
The total resistance in the circuit is
1)
1/6 ampere
2)
6.0 amperes
1)
9Ω
3)
60. amperes
2)
6Ω
4)
600 amperes
3)
3Ω
4)
less than 3 Ω
38. Which circuit segment below
has the same total resistance
as the circuit segment shown
in the diagram to the right?
1)
2)
3)
4)
Answer Key
1.
2
31.
3
2.
3
32.
2
3.
4
33.
4
4.
4
34.
3
5.
2
35.
2
6.
2
36.
1
7.
4
37.
4
8.
1
38.
2
9.
4
10.
4
11.
4
12.
2
13.
2
14.
1
15.
4
16.
3
17.
2
18.
3
19.
1
20.
2
21.
2
22.
1
23.
3
24.
1
25.
4
26.
2
27.
4
28.
2
29.
3
30.
3