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Physics
Physics
Problem
A station must deliver
P
=
200
kW
P = 200\,\text{kW}
P
=
200
kW
through overhead cables whose total resistance is
5
Ω
5\,\Omega
5
Ω
. If the power is sent at
10
kV
10\,\text{kV}
10
kV
or at
100
kV
100\,\text{kV}
100
kV
, what is the ratio of line power loss
P
loss,10 kV
:
P
loss,100 kV
P_{\text{loss,10 kV}} : P_{\text{loss,100 kV}}
P
loss,10 kV
:
P
loss,100 kV
? a)
10
:
1
10:1
10
:
1
b)
100
:
1
100:1
100
:
1
c)
1
:
100
1:100
1
:
100
d)
1
:
10
1:10
1
:
10
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