Interactive Ohm's Law Calculator

Ohm's Law & Power Formulas

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points. It is expressed as V = I × R.

Electrical power (P) is the rate at which electrical energy is transferred. In resistive circuits, it can be calculated using Joule's Law combined with Ohm's Law, leading to formulas like P = V × I, P = I² × R, and P = V² / R.