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Ohm's Law Calculator

Enter voltage and current to calculate resistance and power.

01 / INPUTS

V
A

02 / RESULT

Resistance
6 Ω
Power
24 W

Calculation trace

  1. 12 V ÷ 2 A = 6 Ω
    6 Ω
    Resistance
  2. 12 V × 2 A = 24 W
    24 W
    Power
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How it works

Ohm’s law relates voltage, current and resistance as V = I·R. From the voltage V and current I you enter, resistance is R = V / I and electric power is P = V·I. All three quantities use SI units (volt, ampere, ohm, watt).

Assumptions & limits

  • Assumes a linear, ohmic resistor at steady state (DC or RMS values).
  • Ignores temperature dependence of resistance and any reactive (AC) effects.
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FAQ

What is Ohm’s law?
Ohm’s law states that the current through a conductor is proportional to the voltage across it: V = I·R. It holds for ohmic materials at constant temperature.
How is power calculated?
Electric power is the product of voltage and current, P = V·I, which for a resistor is also P = I²·R = V²/R.
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