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AIEEE 2005 Physics Solved Paper
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© examsnet.com
Question : 47
Total: 74
The resistance of hot tungsten filament is about 10 times the cold resistance. What will be resistance of
100
W
and
200
V
lamp when not in use ?
20
Ω
40
Ω
20
Ω
40
Ω
Validate
Solution:
P
=
V
i
=
V
2
R
R
hot
=
V
2
P
=
200
×
200
100
=
400
Ω
R
cold
=
400
10
=
40
Ω
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