OHM'S LAW QUIZ

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?

18 V

0 V

9 V

900 mV

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YOUR ANSWER : ?

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

4.4

4 k

4

400

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How much resistance is required to limit the current from a 12 V battery to 3.6 mA?

3.3 k

22 k

2.2 k

33 k

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

176 mA

8.16 mA

816 mA

17.6 mA

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

120 mA

12 mA

12 A

1.2 A

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

90 A

9000 A

900 A

9 A

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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?

66

18.3

183

6.6

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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?

8 V

320 V

3.2 V

32 V

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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?

82

820

8.2

8.2 k

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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

112

1.2

18

11.2

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