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Ohm's Law

Ohm's Law
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
112
18

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Ohm's Law
A current of 200 µA through a 6.8 k resistor produces a voltage drop of

340 V
34.4 V
13.6 V
1.36 V

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

400
4 k
4
4.4

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Ohm's Law
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
40
20
4

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Ohm's Law
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?

18.3
66
6.6
183

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

1.2 A
12 mA
120 mA
12 A

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