Ohm's Law Calculator
Apply Ohm's Law to find voltage, current, or resistance in a circuit. Enter any two values to solve for the third.
V
A
Resistance
24.00 Ω
Power6.000 W
Resistance vs Voltage
How Ohm's Law Works
Ohm's Law links voltage, current, and resistance.
Formula
V = I x R
Where:
Rearranging gives R = V / I and I = V / R. Power is P = V x I.
Example Calculation
A 12 V battery drives 0.5 A through a resistor.
- 01Resistance R = V / I = 12 / 0.5 = 24 ohms
- 02Power P = V x I = 12 x 0.5 = 6 W
Frequently Asked Questions
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Ohm's Law Guide
A complete guide to Ohm's Law. Learn the relationship between voltage, current, and resistance, with practical examples, the power triangle, and circuit analysis tips.