Four identical bulbs each rated 100W, 220V are connected across a battery as shown. The total electric power consumed by the bulbs is....
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Step-by-step explanation:
Correct option is
A
75 watt
From figure we see the combination of bulb in series and parallel,so replaced all the bulb with unknown resistance "R"
Power(P)=
R
v
2
so,Resistance{R}=
P
v
2
=
100
220
2
=484Ω.
on solving the equivalent resistance of the circuit we find R
equivalent
=645.33Ω.
therefore total power across the circuit will be(P)=
R
v
2
=
645.33
220
2
=75watt
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