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Electrical Power equation: P = I x V (Electrical power = Current x Potential Difference) Hence if one has a Current in Amps (A) and a Potential Difference in Volts (V), these two values multiplied together give the size of the electrical power, P in Watts. 1 Watt is also equivalent to 1 Joule per second. Hence the units Watts maybe replaced by J/s or Js-1. Also, Using Ohms Law V = I x R (Potential difference = Current x Resistance) The electrical power equation maybe re-written: P = I x I x R = I2 x R = I2R (using V = I x R) or P = (V/R) x V = V2 / R (using I = V/R)

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