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?

59 mA

590 mA

27.2 mA

5.9 mA

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A resistance of 3.3 M is connected across a 500 V source. The resulting current is approximately

660 mA

66 mA

15.1 µA

151 µA

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The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately

1.2

11.2

18

112

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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.

20

2

40

4

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If 750 µA is flowing through 11 k of resistance, what is the voltage drop across the resistor?

14.6 V

8.25 V

82.5 V

146 V

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The formula to find I when the values of V and R are known is

I = V/R

V = IR

I = VR

I = R/V

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When there is 12 mA of current through a 1.2 k resistor, the voltage across the resistor is

1.4 V

14.4 V

10 V

100 V

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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

3.1

38.5

385

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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?

97

23

230

9.7

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What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?

8.2

82

8.2 k

820

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