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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?

8 V
80 V
500 V
50 V

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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

151 µA
66 mA
15.1 µA
660 mA

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Ohm's Law
A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?

2.2 mA
2 mA
21.4 mA
214 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.

20
4
40
2

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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?

6.6
66
183
18.3

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Ohm's Law
The formula to find I when the values of V and R are known is

I = V/R
I = R/V
V = IR
I = VR

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