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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)

**P = I • V**: This computes the power (watts) as a function of current (amps) and potential (volts).**P = R • I²**: This computes the power (watts) as a function of current (amps) and resistance (ohms).**P = V² / R**: This computes the power (watts) as a function of potential (volts) and resistance (ohms).

**Potential:** (volts, millivolts)

**V = I • R**: This computes the potential (volts) as a function of current (amps) and resistance (ohms).**V = P / I**: This computes the potential (volts) as a function of power (watts) and current (amps).**V = √(P • R)**: This computes the potential (volts) as a function of power (watts) and resistance (ohms).

**Resistance:** (ohms, milliohms, kiloohms)

**R = V²/P**: This computes the resistance (ohms) as a function of potential (volts) and power (watts).**R = P / I²**: This computes the resistance (ohms) as a function of power (watts) and current (amps).**R = V / I**: This computes the resistance (ohms) as a function of potential (volts) and current (amps).

**Current: **(amps, milliamps, microamps, gilberts)

**I = V / R**: This computes the current (amps) as a function of potential (volts) and resistance (ohms).**I = P / V**: This computes the current (amps) as a function of the power (watts) and the potential (volts).**I = √(P/R)**: This computes the current (amps) as a function of the power (watts) and the resistance (ohms).

**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 Georg Ohm.

[1] Ohm's Law Source: Wikipedia: URL: http://en.wikipedia.org/wiki/Ohm%27s_law

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