alleryTwo bulbs of 60 W and 100 W are designed for 220 V. Which has higher resistance?
AThe 60 W bulb
BSame resistance
CCannot tell
DThe 100 W bulb
Answer & Solution
Correct answer: A. The 60 W bulb
R = V²/P, so R is inversely proportional to P at fixed V. The lower-wattage bulb has the higher resistance: 60 W bulb has R = 220²/60 ≈ 807 Ω vs 100 W bulb at 484 Ω.
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