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Power factor in AC circuit is:
AV/I
Btan φ
Csin φ
Dcos φ where φ is phase angle between V and I
Answer & Solution
Correct answer: D. cos φ where φ is phase angle between V and I
Power factor (pf) = cos φ. For pure R: pf = 1 (unity). Pure L or C: pf = 0 (reactive). Lagging pf: inductive load. Leading: capacitive. Average power: P = V_rms I_rms cos φ. Reactive power: Q = V_rms I_rms sin φ.
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