Q.

Two bulbs rated 25  W −220V and 100  W −220V are connected in series to a 440 V line. which one is likely to fuse?

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a

25 W bulb

b

100 W bulb

c

Both bulbs

d

None

answer is A.

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Detailed Solution

The resistance of 25 W bulb will be higher than 100 W bulb. So when connected in series across 440 V, potential difference across 25 W bulb will be more than 220 V. Hence, this bulb is likely to fuse.
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