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  4. For a series LCR circuit the power loss at resonance is :-

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Q. For a series LCR circuit the power loss at resonance is :-

AIPMTAIPMT 2002

Solution:

In A.C. circuit power loss $P = V I\, \cos \,\phi$
$P = VI = I ^{2} R $ $(\because \phi=0$ at resonance )