Current Electricity: Bulb in Series vs Parallel MCQ

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Bulb in Series vs ParallelMediumQuestion 31648

Question

Two bulbs (60 W, 100 W) rated at 220 V are connected in series across 220 V. Which glows brighter?

A
100 W bulb
B
60 W bulb
Correct
C
Both equally
D
Neither glows

Correct answer

60 W bulb

Explanation

P_rated = V²/R, so R = V²/P. Higher rated power → lower resistance. In series, current is same; P = I²R → higher resistance (60 W bulb) dissipates more power and glows brighter.

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