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#Engineering

The true power consumed in a.c. circuit is

400 W

600 W

220 W

800 W

Answers (1)

best_answer

Impedence, Z = 33 ohm

Resistance, R = 18 ohm

Voltage = 220 V

$cos\theta =\frac{R}{Z}=\frac{18}{33}=\frac{6}{11}$

Power, $P=\frac{V^{2}}{Z}cos\theta$

$P=\frac{220^{2}}{33}\times \frac{6}{11}=800\ W$

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