Two electric bulbs 100W and 220W are connected in series and the combination is connected to mains of 220V. Calculate,(a)Resistance of each bulb (b) total resistance (c) Power consumed by each bulb.
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Resistances of both the bulbs are
R1=
P
1
V
2
=
25
220
2
R2 =
P2
V
2
=
100
220
2
henceR
1
: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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