Middle School

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Two electric bulbs marked 25 W - 220 V and 100 W - 220 V are connected in series to a 440 V supply. Which of the bulbs will fuse?

A. 100 W
B. 25 W
C. None of these
D. Both

Answer :

Answer:

b. 25W

Explanation:

The 25W bulb has 4 times the resistance of the 100W bulb, so 4/5 of the circuit voltage will develop across that bulb. The 352 volts applied will far exceed the rating of the 25W bulb, causing it to fail.

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