Ohm's Law
Solve voltage, current, resistance, and power when at least two values are known.
Voltage
120 V
Current
5 A
Resistance
24 ohm
Power
600 W
Formula
I = V / R, P = V^2 / R
Calculators
Calculator
Ohm's Law Calculator
Enter any two known electrical values to solve voltage, current, resistance, and power for a DC or simplified resistive circuit.
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Controls engineering use
Use this for quick checks on resistive loads, control-circuit current, voltage, and power. Confirm AC impedance, inrush, duty cycle, manufacturer data, and applicable code requirements separately.