Ohm's Law Calculator (V, I, R, P)

V = I × R (Ohm's Law). P = V × I (Power). Enter any two values to solve for the other two.

What this calculator does

12V circuit, 100Ω resistor → Current = 0.12A, Power = 1.44W.

Frequently asked questions

What is Ohm's Law?

V = I × R. Voltage (volts) = Current (amps) × Resistance (ohms).