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In series LCR circuit R=18Ω and impedance is 33Ω. An r.m.s. voltage 220 V is applied across the circuit. The true power consumed in a.c. circuit is

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  1. 400 W
  2. 800 W
  3. 600 W
  4. 200 W

Solution: The correct answer is A 400 W

Given : Vrms = 220 V, R = 18Ω and Z = 33Ω
We get  P = 400W