The circuit power factor of an RC circuit is 0.620. The rms value of the voltage applied to this signal is 120 V and the impedance is 200 Ω. What is the average power of this circuit?
A) 44.6 W
B) 89.2 W
C) 60.0 W
D) 0.620 W
E) 124 W

Question

Quizplus · Accepted Answer

The average power of an AC circuit is given by the equation P = Vrms * Irms * cos(θ), where Vrms is the rms voltage, Irms is the rms current, and θ is the phase angle between the voltage and current. In this case, the circuit power factor is 0.620, which means that cos(θ) = 0.620. The rms voltage is 120 V and the impedance is 200 Ω, so the rms current is Irms = Vrms / Z = 120 V / 200 Ω = 0.6 A. Therefore, the average power is P = Vrms * Irms * cos(θ) = 120 V * 0.6 A * 0.620 = 44.6 W.

The Circuit Power Factor of an RC Circuit Is 0