An LLRRCC series circuit is connected to a 120 HzHz ac source that has VrmsVrmsV_rms = 88.0 VV. The circuit has a resistance of 75.0 ΩΩ and an impedance at this frequency of 115 ΩΩ. 
Part A What average power is delivered to the circuit by the source? Express your answer with the appropriate units.

average power in seeries LCR circuit is given by
where V is the rms voltage
Z is the impedence
Cos is the power factor which is equal to R/Z
substitute the values in the above formula
P = V2(R/Z)/Z
P = V2R/Z2
P = 88*88*75/(115)2
P = 43.92 Watts
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