Ohm's Law relates voltage (V), current (I), and resistance (R) in electrical circuits: V = I * R. It is foundational for electronics, physics, and electrical engineering.
The Three Forms
Solve for any variable: V = IR, I = V/R, R = V/I. Try the Ohm's Law Calculator.
Example
12V battery, 4 ohm resistor: I = 12/4 = 3A current flows through the circuit.
Related: Electrical Power
Power P = VI = I^2 * R = V^2/R, measured in watts. Higher voltage or current means more power dissipated.
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