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Standard X
Physics
Electric Power
Question
A
100
W
,
200
V
bulb is connected to a
160
V
supply. The actual power consumption would be
185
W
100
W
64
W
54
W
A
185
W
B
100
W
C
54
W
D
64
W
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Solution
Verified by Toppr
Resistance of the bulb
R
=
V
2
P
where
P
=
100
W
and
V
=
200
V.
∴
R
=
(
200
)
2
100
=
400
Ω
Actual power consumption
P
′
=
V
2
1
R
where
V
1
=
160
V
∴
P
′
=
(
160
)
2
400
=
64
W
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