energy newly derived from electric potential energy
Electrical energy is power that comes from the movement of electric charges, derived from electric potential energy. It matters because it powers much of modern life, from lighting and heating to computers and transportation.
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Electrical energy is the energy transferred as electric charges move between points with different electric potential, that is, as they move across a potential difference. As electric potential is lost or gained, work is done changing the energy of some system. The amount of work in joules is given by the product of the charge that has moved, in coulombs, and the potential difference that has been crossed, in volts.
Electrical energy is usually sold by the kilowatt-hour (1 kW·h = 3.6 MJ) which is the product of the power in kilowatts multiplied by running time in hours. Electric utilities measure energy using an electricity meter, which keeps a running total of the electrical energy delivered to a customer.
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