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

$\begin {array} {1 1} (A)\;25W & \quad (B)\;100W \\ (C)\;Both \: of \: them & \quad (D)\;Neither\: of \: them \end {array}$


1 Answer

$R =\large\frac{ V^2}{P}$
Hence, Resistance of the $25W$ bulb is higher.
When connected in series to a $440V$ supply, the potential drop across the $25W$
bulb will be greater than $220V$ and hence it will fuse
Ans : (A)
answered Feb 8, 2014 by thanvigandhi_1
edited Mar 14, 2014 by thanvigandhi_1

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