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Ohm's Law

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

80 V
8 V
500 V
50 V

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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.

40
20
4
2

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

2.2 k
22 k
33 k
3.3 k

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Ohm's Law
What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?

230
23
97
9.7

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

12 mA
120 mA
1.2 A
12 A

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