Alternating CurrentHard

Question

A series LCR circuit is operated at resonance. Then

Options

A.Voltage across R is minimum

B.Impedance is minimum

C.Power transferred is maximum

D.Current amplitude is minimum

Solution

z =
at resonance = X_C, so Z = Z_min = R
& ∵ tanφ = . So power factor, cos θ = 1 = maximum.

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