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Two electric bulbs marked 25W-220V and 1...

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

A

Both

B

100 W

C

25 W

D

Neither

Text Solution

Verified by Experts

Resistacne of both the bulbs are :
`R _(1) = ( V ^(2))/( P _(1)) = ((220 ) ^(2))/( 25)`
`R _(2) = (V ^(2))/( P _(2)) = ((220 ) ^(2))/( 100)`
` (R _(1))/( R _(2)) = ( 100 )/(25) implies R _(1) = 4 R _(2)`
`therefore R _(1) gt R _(2)`
Hence 25 W bulb will fuse.
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