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Ohm's Law

Ohm's Law
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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Ohm's Law
A resistance of 3.3 M is connected across a 500 V source. The resulting current is approximately

15.1 µA
660 mA
66 mA
151 µA

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Ohm's Law
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?

9 V
0 V
18 V
900 mV

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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?

23
230
9.7
97

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

90 A
9 A
900 A
9000 A

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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

18
112
11.2
1.2

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