Two wattmeter connected to measure the input of a balanced 3 Phase circuit indicates 2000 Watts and 500 Watts respectively. What will be the power factor of the circuit when both of the readings are positive?
- A. 0.800
- B. 0.565
- C. 0.750
- D. 0.696
Answer: D. 0.696
Explanation: tanφ = √3(W1−W2)/(W1+W2) = √3×1500/2500 = 1.039, φ ≈ 46.1°, cosφ ≈ 0.694 (closest option 0.696).