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Resistance of Transmission lines

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A high voltage transmission line has an aluminum cable of diameter 3.0 cm , 200 km long . What is the resistance of this cable?

Harleen asked

Answer:

Use the relation R = ρ l/A

A= πr2 =πd2/4

= 3.14 x 3 x 10-2x 3 x 10-2/4

ρ= 2.82×10−8 ohm m

l = 200km = 200000 m = 2 x 105m

You can now just substitute the values and get the answer.

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