PlanetToolbox
Ohm's Law Calculator
Calculate voltage, current, resistance, and power from any two known circuit values.
Voltage
12 V
Current
2 A
Resistance
6 ohms
Power
24 W
Circuit inputs
Solve voltage, current, resistance, and power
Solved values
- Voltage
- 12 volts
- Current
- 2 amps
- Resistance
- 6 ohms
- Power
- 24 watts
Formulas used
FormulaR = V / I
FormulaP = V x I
Ohm's law formulas
Ohm's law uses V = I x R. Electrical power can be solved with P = V x I, P = I^2 x R, or P = V^2 / R depending on which values are known. This calculator assumes steady DC values and positive magnitudes.