Average power in ac circuit and power factor - class-XII

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Multiple Choice

An electrical device draws 2 kW power from ac mains voltage 223 V(rms). The current differs lags in phase by $\phi = tan^{-1} \left ( -\frac{3}{4} \right )$ as compared to voltage. The resistance R in the circuit is:

  1. 15 $\Omega$
  2. 20 $\Omega$
  3. 25 $\Omega$
  4. 30 $\Omega$
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