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109. Here we denote the supply emf as V (understood to be in volts).
The situation is
much like that shown in Fig. 274, with
r
now interpreted as the resistance of the
transmission line and
R
interpreted as the resistance of the “consumer” (the reason the
circuit has been turned on in the first place – to supply power to some resistive load
R
).
From Eq. 274 and Eq. 2627 (remembering that we are asked to find the power
dissipated in the
transmission line
) we obtain
2
line
V
Pr
Rr
⎛⎞
=
⎜⎟
+
⎝⎠
.
Now
r
is considered constant, certainly, but what about
R
?
The load will not be the same
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 Spring '08
 Any
 Physics, Resistance

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