Question

In a series LCR circuit, R=3 ohm , Z=5ohm , irms = 40 A and power factor=0.6. The average power dissi- pated in the circuit is
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Answer 1

Explanation:

Given : Vrms=220 V   R=18Ω   Z=33Ω

True power consumed P=21ZVrms2cosϕ

where cosϕ=ZR

⟹ P=2Z2Vrms2R

∴  P=2×332220×220×18

We get  P=400W