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electric power


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The rate of expending energy or doing work in an electrical system. For a direct-current circuit, it is given by the product of the current passing through a system and the potential difference across it. In alternating-current circuits, the power is given by VIcosɸ, where V and I are the RMS values and ɸ is the phase angle. Cosɸ is called the power factor of the circuit.

Subjects: Physics.


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