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In an AC circuit, the current is 3 A, the voltage is 210 V and the power is 63 W. The power factor is

Asked in GUJCET 2017 · Power factor

• (1) 0.11
• (2) 0.09
• (3) 0.08
• (4) 0.10

Step-by-step solution

Why the other options are wrong

• (1) No single slip gives 0.11; it would need VI=573 VA. Sanity check: 210×3=630 VA, and (63)/(630)=0.10 exactly.
• (2) No single slip gives 0.09; it would need VI=700 VA. Sanity check: (63)/(210×3)=(63)/(630)=0.10.
• (3) No single slip gives 0.08. Sanity check: cos φ=P/(VI)=(63)/(630)=0.10.

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