Power is the rate of doing work, i.e. it is the work done (or energy consumed) in 1 s. In an electrical circuit, we define power as the rate at which electrical energy is supplied by the source.
The SI unit of power is watt (W) or J s−1. One watt is the power consumed when a current of 1 ampere flows through a circuit with a potential difference of 1 volt.
Electrical Power and Household Circuits PDF
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