Solve V = IR for voltage, current, resistance, or power
Ohm's Law states V = I × R. Combined with P = V × I, any one of the four quantities can be found from any two others. The calculator solves all four formulas simultaneously.
V = I × R · I = V / R · R = V / I · P = V × I = I² × R = V² / R
Ohm's Law applies to resistive (linear) elements only — not to diodes, transistors, or reactive components. Power dissipated as heat: P = I² × R.