The rate at which electric energy is consumed in an electric circuit is'
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Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second.
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POWER IS THE RATE AT WHICH ELECTRIC ENERGY CONSUMED BY THE ELECTRICAL APLIANCE IN ANY CIRCUIT.Rate at which energy is dissipated or consumed is expressed in terms of power (or power-time).
It is always better to work with energy/time rather than energy itself because the input to the system and output from the system vary with respect to time. As far as I know, we cannot provide an input that is not varying with time (one may contradict by saying that DC doesn't vary with time but remember DC is nothing but the limiting case of AC). In fact, even the galvanic cells stop producing energy after a few months.
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