If two bulbs of power 60W and 100W respectively each rated 110V are connected in series with the supply of 220V then
1)60 W bulb will fuse. 2)100 W bulb will fuse 3)both bulbs will fuse.
4)Bulbs will not fuse

Dear Student,

Resistance, R=V2PResistance of 60 W bulb=110×11060=201.67 ohmIts safe current=110201.67=0.54 AResistance of 100 W bulb=110×110100=121 ohmIts safe current=110121=0.9 AWhen connected in series to 220 V supply, then the current I=220201.67+121I=220322.67=0.68 AThus, current is greater for 60 W bulb. Hence it will fuse.

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