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Ohm's Law Calculator

Solve Ohm's law for any unknown and find electrical power.
Enter any two values — the rest are calculated automatically.

V

​

A

​

Ω

​
Voltage

10 V

Current

2 A

Resistance

5 Ω

Power

20 W

Formula
V = I × R • P = V × I

Frequently asked questions

Ohm’s law states that voltage equals current times resistance (V = IR).

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