Ohm's Law Calculator

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).

The Math / Science

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.

REFERENCE

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