Ohm's Law Calculator

Your details

Choose any two of the four quantities; the calculator solves the other two.
The potential difference across the component.
The current flowing through the component.
Currency
Resistance
6Ω

R = V ÷ I

Voltage12V
Current2A
Power24W
Voltage (V)12
Current (A)2
Resistance (Ω)6
Power (W)24

12 V and 2 A give 6 Ω and 24 W.

  • Voltage 12 V, current 2 A, resistance 6 Ω and power 24 W all follow from your two known values.
  • The three power forms (P = V × I, P = I² × R, P = V² / R) all give this same wattage for a resistive load.
  • This assumes an ideal ohmic resistor at constant temperature; real parts drift with heat and frequency.

Next stepSwitch the "I know" selector to solve from a different pair, or turn on the cost estimate to price the load.

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