About this tool
Ohm's law relates voltage, current and resistance in a linear DC circuit. Pick which variable to solve for.
Formula
V = I · R
Worked example
12 V across a 6 Ω resistor → I = 12/6 = 2 A.
Notes
Holds for ohmic conductors (resistors, metal wires). Diodes and transistors are nonlinear. For AC circuits, replace R with complex impedance Z.