Ohm's Calc

Not Reviewed
Calculator / Last modified by KurtHeckman on 2017/03/14 14:41
`P=I*V` `P=R*I^2` `P=V^2` / `R`
`V=I*R` `V=P/I` `V=sqrt(P * R)`
`I=P/V` `I=sqrt(P/R)` `I=V/R`
`R=P/I^2` `R=V/I` `R=V^2/P`

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. V=IR.png 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)Ohls-illustration.png           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).