Ohm's Law Calculator

Voltage mode: current in amps. Current mode: voltage in volts. Resistance/power modes: voltage in volts.
Voltage mode: resistance in ohms. Current mode: resistance in ohms. Resistance/power modes: current in amps.
Worked example result
Voltage20.0000 V
Current2.0000 A
Resistance10.0000 Ω
Power40.0000 W

A current of 2 A through a 10 Ω resistor needs 20 V and dissipates 40 W.

V = I × R; P = V × I (also I = V ÷ R, R = V ÷ I) · Powered by CalcHub — Ohm's Law Calculator