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Ohm's Law Calculator

Choose what you want to calculate and enter the values you know.

STEP 1

What do you want to calculate?

Voltage Calculate V
Current Calculate I
Resistance Calculate R
Power Calculate P
Result

What is Ohm's Law?

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

V = I × R

Ohm's Law Formulas

Voltage:

V = I × R

Current:

I = V ÷ R

Resistance:

R = V ÷ I

Power:

P = V × I

Example

Suppose you have a 12 V power supply connected to a 6 Ω resistor.

I = 12 ÷ 6 = 2 A

The current through the resistor is 2 A.