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Ohm's Law

Ohm's Law
What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?

820
8.2
82
8.2 k

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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
214 mA
21.4 mA

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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
9.7
97
230

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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
220 k
22 k

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Ohm's Law
How much resistance is needed to draw 17.6 mA from a 12 volt source?

680
212
6.8 k
68

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

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

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