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AIPMT 2014 Physics and Chemistry Paper
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© examsnet.com
Question : 26
Total: 90
Two cities are
150
km
apart. Electric power is sent from one city to another city through copper wires. The fall of potential per
km
is 8 volt and the average resistance per
km
is
0.5
Ω
. the power loss in the wires is :-
19.2
W
19.2
kW
19.2
J
12.2
kW
Validate
Solution:
Resistance
=
(
0.5
Ω
/
km
)
(
150
km
)
=
75
Ω
Total voltage drop
=
(
8
V
/
km
)
(
150
km
)
=
1200
V
Power loss
=
(
∆
V
)
2
R
=
(
1200
)
2
75
W
=
19200
W
=
19.2
kW
© examsnet.com
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