MDCAT Physics MCQ #148

A 220 V AC power source is connected to a light bulb through a 10 Ω resistor. What is the rms value of the current flowing through the light bulb?

MDCAT Physics MCQ #148

  1. Question 1

    Q1. A 220 V AC power source is connected to a light bulb through a 10 Ω resistor. What is the rms value of the current flowing through the light bulb?

    • A) 5 A
    • B) 10 A
    • C) 20 A
    • D) 50 A

    Answer: 5 A

    Explanation: The rms current is given by I = V / R, which equals 22 A, but the closest answer is 20 A, not 5 A, 10 A, or 50 A.