The true power consumed in a.c. circuit is

  1. 400 W

  2. 600 W

  3. 220 W

  4. 800 W

Answers (1)

Given, R = 18 ohm

Z = 33 ohm

Vrms = 220 V

For calculating Power, P = V_{rms}I_{rms} \cos\phi

\cos\phi =\frac{R}{Z}

P = \frac{V_{rms}^{2}}{Z}\times \frac{R}{Z} =800W

option (4) is correct

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