Ohm's Law Calculator — Voltage, Current, Resistance, Power
Calculate voltage, current, resistance, and power using Ohm's Law. Fill any 2 fields to find the other 2.
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Frequently Asked Questions
What is Ohm's Law?
Ohm's Law states that V = I × R — Voltage equals Current multiplied by Resistance. It's fundamental to all electrical circuit analysis.
How do I use the calculator?
Enter any two known values (V, I, R, or P) and the calculator will solve for the other two automatically.
What is Power in this context?
Electrical power P = V × I (watts). It represents the rate of energy consumption or generation in a circuit.
What units should I use?
Use Volts (V), Amperes (A), Ohms (Ω), and Watts (W). The calculator works with any consistent set of SI units.