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How to use Ohm

Enter any two of voltage, current, resistance or power. The calculator applies Ohm's law to solve for the remaining electrical values instantly.

Frequently asked questions

What is Ohm's law?

Ohm's law states V = I × R: voltage equals current times resistance. From any two values you can find the third, and power follows as P = V × I.

How is electrical power calculated?

Power P = V × I, and by substitution P = I² × R or P = V² / R. Enter any two of the four quantities and the calculator derives the rest.

What units does the calculator use?

Voltage is in volts (V), current in amperes (A), resistance in ohms (Ω) and power in watts (W). Enter values in these base units for correct results.

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