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Two bulbs rated 25 W, 220 V and 100 W, 220 V are connected in series across a 440 V supply. Which bulb is more likely to fuse?

1. The 25 W bulb
2. The 100 W bulb
3. Both bulbs equally
4. Neither bulb

Correct answer: The 25 W bulb

Solution

The 25 W bulb has the larger resistance, so in series it takes a larger share of voltage and dissipates more power than its rating, making it fuse first.

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