Ohm’s law & electrical power calculator

How it works

Enter two of voltage, current, resistance and power to get the others.

The formula

V = I × R. P = V × I = I²R = V² ÷ R.

Worked example

12 V across 6 Ω: I = 12 ÷ 6 = 2 A and P = 12 × 2 = 24 W.

Good to know