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If 25W, 220 V and 100 W, 220 V bulbs are connected in series across a 440 V line, then (a) Only 25 W bulb will fuse (b) Only 100 W bulb will fuse (c) Both bulbs will fuse (d) None of these



If 25W, 220 V and 100 W, 220 V bulbs are connected in series across a 440 V line, then


(a)    Only 25 W bulb will fuse


(b)    Only 100 W bulb will fuse


         (c)    Both bulbs will fuse


(d)    None of these


Grade:11

2 Answers

Rakesh Singh
46 Points
7 years ago

Images

 

 

 

Hrishant Goswami
343 Points
7 years ago

(a) As for an electric appliance R = (V12/W), so for same specified voltage Vs


From this, it is clear that voltage across 100 W bulb (= 88 V) is lesser than specified (220 V) while across 25 W bulb (= 352 V) is greater than specified (220 V), so, 25 W bulb will fuse.

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