# Ohm's Calc

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The Ohm's Law calculator computes power (watts), potential (voltage), current (amps) and resistance (ohms) in relation to each other based on Ohm's Law. There is a fundamental relationship between electrical parameters: potential, current, resistance and power depicted in the graphical wheel (see wheel).

The calculator has automatic unit conversions for the input and output of the equations.  The equations are as follows:

Power(watts)

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

Potential (voltage)           Power - Current - Potential - Impedance

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

Resistance(ohms)

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

Current (amps)

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