The power in an AC circuit is \(P = {E_{rms}}{I_{rms}}\cos \phi \). T – McqOptions

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1.	The power in an AC circuit is \(P = {E_{rms}}{I_{rms}}\cos \phi \). The value of \(\cos \phi \) in the series LCR circuit at resonance is
A.	Zero
B.	1
C.	1/2
D.	\(\frac{1}{{\sqrt 2 }}\)
Answer» C. 1/2

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