The true power consumed in a.c. circuit is

  1. 400 W
  2. 600 W
  3. 220 W
  4. 800 W

Answers (1)
S Sayak

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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