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Derive an expression for average power i...

Derive an expression for average power is an A.C. circuit containing resistor only.

Text Solution

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`P_(av) = E_vI_vcosphi`
where `phi` = Phaşe difference between current and voltage
`P_(av)` will be maximum when `cos phi = 1`
`impliesphi =0^@`
So average power will be maximum when current and voltage are in same phase.
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