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

Correct Answer: 25 W

Explanation:

Resistances of both the bulbs are


 


R1=V^2/P1 = 220^2/25


 


R2 = V^2/P2 = 220^2/100


 


Hence   R 1 g t   ;   R 2


 


When connected in series, the voltages divide in them in the ratio of their resistances. The voltage of 440 V devides in such a way that voltage across 25 w bulb will be more than 220 V. Hence 25 w bulb will fuse.


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