engineering physics MCQ #77

The current in an AC circuit is wattless when

engineering physics MCQ #77

  1. Question 1

    Q1. The current in an AC circuit is wattless when

    • A) φ = 0
    • B) φ = π / 2
    • C) φ = π / 4
    • D) φ = π

    Answer: φ = π / 2

    Explanation: When φ = π / 2, power factor = cos(π / 2) = 0, so the current is wattless.