Alternating CurrentHard

Question

An AC source supplies a current of 10 A (rms) to a circuit, rms voltage of source is 100 V. The average power delivered by the source :   

Options

A.must be 1000 W
B.may be less than 1000 W
C.may be greater than 1000 W
D.may be 1000 W

Solution

Pavr = Irms Vrms cos φ
cos φ can not be more than 1 so power can not be more than 1000.

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