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Ohm's law & power

Solve voltage, current, resistance, and power from any two known values.

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Ohm's law & power

Enter any two values — the other two are calculated automatically.

Voltage —
Current —
Resistance —
Power —

Formulas used

  • V = I × R
  • I = V ÷ R
  • R = V ÷ I
  • P = V × I
  • P = I² × R
  • P = V² ÷ R