Physical Science: Electricity and Magnetism, Book N

Chapter 1: Electricity

Standardized Test Practice

1
Which appliance uses the least energy if it is run for 20 minutes?

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A)color TV
B)computer
C)hair dryer
D)toaster
2
What is the current in the computer if it is plugged into a 110-V outlet?

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A)3.2 A
B)0.31 A
C)0.35 A
D)3.9 A
3
How much would it cost to run the stereo for 2 hours if 1,000 W of power costs $0.12 per hour?

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A)$0.12
B)$0.24
C)$0.06
D)$0.48
4
Of current, resistance, and voltage, which can vary among different branches of a parallel circuit?
A)only resistance
B)only current and resistance
C)only voltage
D)only current and voltalge
5
What property of a light bulb's filament causes it to glow?
A)high voltage
B)high resistance
C)low resistance
D)low voltage
6
Which statement describes how electric charges affect each other?
A)positive and negative charges repel
B)two positive charges attract
C)two negative charges attract
D)positive and negative charges attract
7
What grounding device is sometimes placed on the tops of buildings?
A)lightning rod
B)circuit
C)circuit breaker
D)fuse
8
How does the power use change if the resistance of the device increases from 5 Ω to 20 Ω?

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A)divided by 5
B)divided by 4
C)multiplied by 4
D)multiplied by 5
9
If a thin and a thick wire are otherwise identical, what property is lower for the thicker wire?
A)current
B)static charge
C)resistance
D)voltage
10
A simple electrical circuit has two lightbulbs with a resistance of 0.15 Ω each. If the circuit has a voltage of a 6.3-V, what is the current?
A)1.9 A
B)2.3 A
C)2.1 A
D)4.2 A
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