An electrical device draws 2 kW power from ac mains voltage 223 V(rms). The current…
Physics · Class 12 · CBSE — Alternating Current
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
- 15 W
- 20 W
- 25 W
- 30 W
Answer
(B) 20 W
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