The Ohm's Law Calculator computes power(watts), potential (volts), resistance (ohms) and current (amps) based on the three variants of Ohm's Law. The calculator has automatic unit conversions of inputs and outputs.
Power: (watts, milliwatts, kilowatts, horsepower)
Potential: (volts, millivolts)
Resistance: (ohms, milliohms, kiloohms)
Current: (amps, milliamps, microamps, gilberts)
Ohm's Law states that the electric current through an electric conductor between two points is directly proportional to the potential difference (voltage) across the two points. As an equation this is simply I = V/R.
Ohm's Law established relations between potential (voltage), current, resistance and power. See wheel graphic.
The law was named after the German physicist.
 Ohm's Law