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Ohm's Law

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

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

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

500 V
80 V
50 V
8 V

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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
18 V
900 mV
0 V

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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?

214 mA
2.2 mA
21.4 mA
2 mA

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Ohm's Law
When 12 V are applied across a 68 resistor, the current is

816 mA
8.16 mA
17.6 mA
176 mA

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Ohm's Law
When there is 12 mA of current through a 1.2 k resistor, the voltage across the resistor is

1.4 V
14.4 V
10 V
100 V

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