OHM'S LAW QUIZ

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

2.2 mA

214 mA

21.4 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

38.5

3.1

31

385

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Approximately how much current flows through a 3.3 M resistor across a 30 V source?

90 A

9000 A

9 A

900 A

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

27.2 mA

59 mA

5.9 mA

590 mA

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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.

40

20

2

4

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

120 mA

12 A

1.2 A

12 mA

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

82.5 V

14.6 V

146 V

8.25 V

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You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?

0 V

9 V

18 V

900 mV

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

80 V

500 V

50 V

8 V

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

10 V

14.4 V

1.4 V

100 V

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