Question Detail
Question
The apparent power developed in an R-L circuit is 30VA. If source is 36V, 50Hz and resistor is 40Ω, determine the power factor.
Correct Answer
Option B is the correct answer.
Detailed Explanation
I = S/V = 30/36 = 0.833A. P = I²R = 0.833²×40 = 27.78W. pf = P/S = 27.78/30 = 0.926 ≈ 0.93.
Hint
Power factor = True power / Apparent power.