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Ohm's Law

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

2.2 k
220 k
22 k
220

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Ohm's Law
Approximately how much current flows through a 3.3 M resistor across a 30 V source?

9 A
9000 A
90 A
900 A

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Ohm's Law
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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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.

4
40
2
20

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Ohm's Law
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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