VOLTAGE, CURRENT AND RESISTANCE QUIZ

Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?

4 k

4.4

400

4

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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?

59 mA

27.2 mA

590 mA

5.9 mA

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

50 V

500 V

8 V

80 V

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A current of 200 µA through a 6.8 k resistor produces a voltage drop of

340 V

34.4 V

1.36 V

13.6 V

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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

18

11.2

112

1.2

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If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is

2.2 k

220

220 k

22 k

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

120 mA

1.2 A

12 A

12 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.

20

40

4

2

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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

8.25 V

146 V

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If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?

3.2 V

8 V

32 V

320 V

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