AnswersFL-2003310-Physical Science CRUnit Test

Ohm's Law Answers

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Jaipal measures a circuit at 1.2 A and 24 . Using Ohm’s law, what can he calculate for the circuit?

Question illustration
A
current (C)
B
current (I)
C
voltage (V)
D
voltage (A)
2
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A circuit has a current of 2.4 A. The voltage is increased to 4 times its original value, while the resistance stays the same.

A
It should decrease to one-half of its value.
B
It should decrease to one-fourth of its value.
C
It should increase to two times its value.
D
It should increase to four times its value.
3

Which symbol and unit of measurement are used for electric current?

A
symbol: A; unit: I
B
symbol: C; unit: A
C
symbol: I; unit: C
D
symbol: I; unit: A
4

What is the resistance of a light bulb if a potential difference of 120 V will produce a current of 0.5 A in the bulb?

A
0.0042
Option A
B
0.5
Option B
C
60
Option C
D
240
Option D
5

Which statement describes the relationship of voltage and current?

A
Voltage is directly proportional to current because I = .
Option A
B
Voltage is inversely proportional to current because I = .
Option B
C
Voltage is directly proportional to current because I = VR.
D
Voltage is inversely proportional to current because I = VR.
6

When the resistance in a circuit remains constant, how are the voltage and current related?

A
The current doubles when the voltage doubles because they are directly proportional.
B
The current doubles when the voltage doubles because they are inversely proportional.
C
The current is cut in half when the voltage doubles because they are directly proportional.
D
The current is cut in half when the voltage doubles because they are inversely proportional.
7

Which symbol and unit of measurement are used for voltage?

A
symbol: V; unit: A
B
symbol: R; unit :
Option B
C
symbol: V; unit: V
D
symbol: R; unit: V
8

According to Ohm’s law, which combination of units is the same as the unit for resistance?

A
volt ÷ ampere
B
ampere × volt
C
volt + ampere
D
ampere ÷ volt
9

A hair dryer has a resistance of 11.5 . What current does it conduct when it is plugged into a wall outlet that provides 120 V?

Question illustration
A
0.10 A
B
10.4 A
C
109 A
D
1380 A
10

Which statement describes the relationship of resistance and current?

A
Resistance is directly proportional to current because R = .
Option A
B
Resistance is inversely proportional to current because R = .
Option B
C
Resistance is directly proportional to current because R = VI.
D
Resistance is inversely proportional to current because R = VI.

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