MDCAT Physics MCQ #242

A student using a 100 W light bulb at 120 V AC notices a drop in brightness when a 200 Ω resistor is added in series. Why does the brightness decrease?

MDCAT Physics MCQ #242

  1. Question 1

    Q1. A student using a 100 W light bulb at 120 V AC notices a drop in brightness when a 200 Ω resistor is added in series. Why does the brightness decrease?

    • A) The bulb is overloaded
    • B) The resistor dissipates energy
    • C) The bulb has an inductive reactance
    • D) The bulb has a resistive reactance

    Answer: The resistor dissipates energy

    Explanation: The added resistor dissipates energy, reducing the bulb's power output and brightness