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?

# Two bulbs rated $\left(25\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{W}\text{\hspace{0.17em}}-220V\right)$ and $\left(100\text{\hspace{0.17em}\hspace{0.17em}}W\text{\hspace{0.17em}}-220V\right)$ are connected in series to a 440 V line. which one is likely to fuse?

1. A

25 W bulb

2. B

100 W bulb

3. C

Both bulbs

4. D

None

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### 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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