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Ohm's Law Calculator

Find resistance and power from voltage and current using Ohm's Law.

Inputs

Saved Scenarios

— select 2+ to compare

Resistance (Ω)

6.00

Power (W)

24.00

Spark says

How it's calculated

Formula

R=VIP=V×IR = \dfrac{V}{I} \quad\quad P = V \times I
V
— Voltage (volts)
I
— Current (amps)
R
— Resistance (ohms)
P
— Power (watts)

What is the Ohm's Law Calculator?

Ohm's Law describes the relationship between voltage, current and resistance in an electrical circuit: voltage equals current times resistance.

How to use it

  1. 1 Enter the voltage across the component.
  2. 2 Enter the current flowing through it.

Worked examples

12V at 2A

Resistance is 6Ω, power is 24W.

Try it

Frequently asked questions

What is Ohm's Law?

Ohm's Law states V = I × R — voltage equals current multiplied by resistance. Rearranging gives R = V/I and I = V/R.