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1. Which quantity must be the same for each component in any
series circuit?
1) power
3) current
2) resistance
4) voltage
7. How long must a 100-watt light bulb be used in order to
dissipate 1,000 joules of electrical energy?
1) 10 s
3) 1,000 s
2) 100 s
4) 100,000 s
2. 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?
1) Connect four 1-ohm resistors in parallel.
2) Connect only two 1-ohm resistors in parallel.
3) Connect two of the 1-ohm resistors in series and two in
parallel.
4) Connect four 1-ohm resistors in series.
8. If 60. electrons pass a given point in a conductor in one
second, the current in this conductor is
1) 2.7 × 10–21 A
3) 1.6 × 10–20 A
–19
2) 1.6 × 10 A
4) 9.6 × 10–18 A
9. In the circuit represented by the diagram below, what is the
reading of voltmeter V?
3. A 10.-ohm resistor and a 20.-ohm resistor are connected in
series to a voltage source. When the current through the 10.ohm resistor is 2.0 amperes, what is the current through the
20.-ohm resistor?
1) 1.0 A
3) 0.50 A
2) 2.0 A
4) 4.0 A
4. What is the total resistance of the circuit segment shown in
the diagram below?
1) 20. V
2) 2.0 V
3) 30. V
4) 40. V
10. In a flashlight, a battery provides a total of 3.0 volts to a
bulb. If the flashlight bulb has an operating resistance of 5.0
ohms, the current through the bulb is
1) 1.7 A
3) 0.60 A
2) 0.30 A
4) 1.5 A
11. What is the current in the circuit represented in the diagram
below?
1) 1.0 Þ
2) 9.0 Þ
3) 3.0 Þ
4) 27 Þ
5. Two identical resistors connected in series have an
equivalent resistance of 4 ohms. The same two resistors,
when connected in parallel, have an equivalent resistance of
1) 1 Þ
3) 8 Þ
2) 2 Þ
4) 4 Þ
6. A complete circuit is left on for several minutes, causing the
connecting copper wire to become hot. As the temperature
of the wire increases, the electrical resistance of the wire
1) decreases
3) remains the same
2) increases
1) 1 A
2) 2 A
3) 3 A
4) 6 A
12. Ammeters A1, A2 and A3 are placed in a circuit as shown
below.
What is the reading on ammeter A3?
1) 1.0 A
3) 3.0 A
2) 2.0 A
4) 5.0 A
13. In the circuit diagram shown below, what is the current
through the 4.0-ohm resistor?
1) 1.0 ampere
2) 0.33 ampere
16. The diagram below shows a
resistor of 5 ohms and a
resistor of 10 ohms
connected in parallel in a
circuit. What is the total
resistance of the circuit?
1) less than 5 ohms
2) 5 ohms
3) 15 ohms
4) greater than 15 ohms
17. A 12-volt battery is connected to resistors R1 and R2 as
shown in the diagram below. If the reading of voltmeter V1
is 8 volts, what is the reading of voltmeter V2?
3) 3.0 amperes
4) 48 amperes
14. In the circuit shown at the right, the potential difference
across the 4.0-ohm resistor is
1) 20. volts
2) 12 volts
3) 8 volts
4) 4 volts
18. While operating at 120 volts, an electric toaster has a
resistance of 15 ohms. The power used by the toaster is
1) 8.0 W
3) 960 W
2) 120 W
4) 1,800 W
19. What is the resistance at 20.ºC of a 2.0-meter length of
tungsten wire with a cross-sectional area of
7.9 × 10–7 meter2?
1) 5.7 × 10–1 Þ
3) 7.1 × 10–2 Þ
–1
2) 1.4 × 10 Þ
4) 4.0 × 10–2 Þ
1) 6.0 volts
2) 2.0 volts
3) 3.0 volts
4) 12 volts
15. The resistance of a 60.-watt lightbulb operated at 120 volts
is approximately
1) 720 Þ
3) 120 Þ
2) 240 Þ
4) 60. Þ
20. When three 30-ohm resistors are connected in parallel
across a 9-volt source, the total current is
1) 0.10 A
3) 0.45 A
2) 0.30 A
4) 0.90 A
21. A lamp operates at 10 volts and draws a current of .5
ampere for 60 seconds. What power is developed by the
lamp?
1) 5 watts
3) 300 watts
2) 30 watts
4) 600 watts
22. Which circuit diagram below correctly shows the connection
of ammeter A and voltmeter V to measure the current
through and potential difference across resistor R?
1)
2)
25. A copper wire of length L and cross-sectional area A has
resistance R. A second copper wire at the same temperature
has a length of 2L and a cross-sectional area of 12A. What is
the resistance of the second copper wire?
1) 2R
2) 4R
3) R
4) 1 R
2
26. What is the total electrical energy used by a 1500-watt hair
dryer operating for 6.0 minutes?
1) 4.2 J
3) 9.0 ×0 J
2) 250 J
4) 5.4 ×0 J
27. Three ammeters are located near junction P in a direct
current circuit as shown in the diagram below.
3)
4)
If ammeter Al reads 3 amperes and ammeter A2 reads 4
amperes, then what does ammeter A3 read?
1) 5 A
3) 3 A
2) 7 A
4) 8 A
23. As the number of resistors in a parallel circuit is increased,
what happens to the equivalent resistance of the circuit and
total current in the circuit?
1) Both equivalent resistance and total current decrease.
2) Equivalent resistance decreases and total current
increases.
3) Both equivalent resistance and total current increase.
4) Equivalent resistance increases and total current
decreases.
24. The current through a lightbulb is 2.0 amperes. How many
coulombs of electric charge pass through the lightbulb in
one minute?
1) 60. C
3) 120 C
2) 2.0 C
4) 240 C
28. A piece of wire has a resistance of 8 ohms. A second piece
of wire of the same composition, diameter, and temperature,
but one-half as long as the first wire, has a resistance of
1) 8 
3) 16 
2) 2 
4) 4 
29. A copper wire has a resistance of 200 ohms. A second
copper wire with twice the cross-sectional area and the same
length would have a resistance of
1) 50
3) 200
2) 100
4) 400
30. A copper wire is part of a complete circuit through which
current flows. Which graph best represents the relationship
between the wire's length and its resistance?
1)
31. A potential difference of 12 volts is applied across a circuit
which has a 4.0-ohm resistance. What is the magnitude of
the current in the circuit?
1) 0.33 A
3) 3.0 A
2) 48 A
4) 4.0 A
32. A charge of 5.0 coulombs moves through a circuit in 0.50
second. The current in the circuit is
1) 7.0 A
3) 2.5 A
2) 5.0 A
4) 10. A
2)
33. The graph at the right shows how
the voltage and current are related
in a simple electric circuit. For any
point on the line, what does the ratio
of V to I represent?
1) power in watts
2) resistance in ohms
3)
4)
3) charge in coulombs
4) work in joules
Reference Tables
Answer Key
electrity test a [Mar 31, 2009]
1.
3
30.
3
2.
4
31.
3
3.
2
32.
4
4.
1
33.
2
5.
1
6.
2
7.
1
8.
4
9.
4
10.
3
11.
1
12.
1
13.
3
14.
4
15.
2
16.
1
17.
4
18.
3
19.
2
20.
4
21.
1
22.
2
23.
2
24.
3
25.
2
26.
4
27.
2
28.
4
29.
2