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SSC JE Electrical Engineering 2010 Solved Paper
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© examsnet.com
Question : 5
Total: 50
The ratio of resistances of a 100 W, 220 V lamp to that of a 100 W, 110 V lamp will be at respective voltages
4
2
1
2
1
4
Validate
Solution:
R
1
=
220
2
100
=
V
2
W
, for 100W, 220V
R
2
=
110
2
100
,
for 100W, 110V
R
1
R
2
=
(
220
110
)
2
×
100
100
=
4
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