Question Detail
Question
Apparent power = 30 VA, source 36V, R=40Ω. Power factor?
Correct Answer
Option B is the correct answer.
Detailed Explanation
I = S/V = 30/36 = 0.8333 A. P_real = I²R = (0.8333)² × 40 = 27.78 W. pf = P_real/S = 27.78/30 = 0.926 ≈ 0.93. Option B.
Hint
pf = P/S = I²R / (VI).