Saturday, January 5, 2013

Electric Power

The rate at which electric work is done by the source of emf in maintaining the current in electric circuit


Therefore Electric Power (P) = W/t =VIt/t=VI watt or joule/s

Power is said to be one watt if one ampere of current flows I it against a potential difference of 1 volt
Commercial unit of power is horse power, 1HP=746watt


It is the chemical energy of cell which supplies the power to the circuit.

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