Ohm's Law Calculator
Solve for voltage, current, or resistance using V=IR. Enter any two values to find the third.
How It Works
Solve for voltage, current, or resistance using V=IR. Enter any two values to find the third. Enter your values above and click Calculate to get instant results.
Formula
V = I × R | I = V / R | R = V / I | P = V × I
Quick Examples
- 12V battery, 4Ω resistor → I = 12/4 = 3A
- 5A current, 10Ω resistor → V = 5×10 = 50V
- 120V supply, 2A current → R = 120/2 = 60Ω
Frequently Asked Questions
What is Ohm's Law?
Ohm's Law states that V = I × R, where V is voltage in volts, I is current in amperes, and R is resistance in ohms. It describes the relationship between these three fundamental electrical quantities.
How do I use this calculator?
Enter any two of the three values (Voltage, Current, Resistance) and leave the third blank. Click Calculate to solve for the unknown quantity.