Question

Two bulbs rated (25 W - 220 V) and (100 W - 220 V) are connected in series to a 440 V line. Which one is likely to fuse?

• A. 25 W bulb
• B. 100 W bulb
• C. both bulbs
• D. none

Answer 1

The correct option is A 25 W bulb

Power is given by,
$P=VI$
When two bulbs are connected in series, then the bulb with less power will fuse as compared with the bulb with higher power.
$P=I^{2}R$
Where variables have their usual meanings. According to this relation the bulb with less power will fuse when subjected to higher load.