EM

an emf of V = 150 cos 377t is applied to a pure resistor of resistance 50 Î© .

what is frequency of power variation

1 Answers

P = V²/R

P = (150)²cos ² 377t 50

P = 450 cos ² 377t

P = 450( 1 + cos 2. 377t)

P = 450 + 450cos 754t

compare 450cos 754t with A cos wt

we get w = 754 = 2pi/T.

1/T = 754/2pi = 120 Hz.

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