OHM'S LAW QUIZ

Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 k of resistance?

27.2 mA

590 mA

5.9 mA

59 mA

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An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately

31

385

38.5

3.1

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A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.

2

4

20

40

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A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?

2 mA

21.4 mA

2.2 mA

214 mA

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What is the voltage source for a circuit carrying 2 A of current through a 36 resistor?

18 V

7.2 V

1.8 V

72 V

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What is the approximate filament resistance of a light bulb if it operates from a 110 V source and 0.6 A of current is flowing?

6.6

66

183

18.3

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When 12 V are applied across a 68 resistor, the current is

8.16 mA

816 mA

17.6 mA

176 mA

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How much current is produced by a voltage of 18 kV across a 15 k resistance?

1.2 A

120 mA

12 A

12 mA

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What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?

23

9.7

230

97

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How much voltage is needed to produce 2.5 A of current through a 200 resistor?

8 V

500 V

50 V

80 V

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