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JEE Physics · Hard

Current Electricity: Power in Series MCQ

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Power in SeriesHardQuestion 31666

Question

Three heaters (100 W, 200 W, 400 W, all rated 220 V) in series across 220 V. Which has highest power consumption?
  1. A
    100 W heater
    Correct
  2. B
    200 W heater
  3. C
    400 W heater
  4. D
    All equal

Correct answer

100 W heater

Explanation

P_rated = V²/R, so R₁ = 484 Ω, R₂ = 242 Ω, R₃ = 121 Ω. In series, same current I. P = I²R → highest R (100 W heater) dissipates most. Series inverts the power ranking.

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