engineering physics MCQ #931

A 100 W, 220 V bulb is connected to a 110 V supply. The power consumed is

engineering physics MCQ #931

  1. Question 1

    Q1. A 100 W, 220 V bulb is connected to a 110 V supply. The power consumed is

    • A) 25 W
    • B) 50 W
    • C) 100 W
    • D) 200 W

    Answer: 25 W

    Explanation: Using P = V² / R, first find R = V² / P = 220² / 100, then P = 110² / R = 110² / (220² / 100) = 25 W