A high-voltage power transmission line is 200 km long, and is constructed of aluminium cable of diameter 30 mm. What is the resistance of this length of cable? (Resistivity of aluminium is 2.8×10-8 Qm.) MMA m

A high-voltage power transmission line is 200 km long, and is constructed of aluminium cable of diameter 30 mm. What is the resistance of this length of cable? (Resistivity of aluminium is 2.8×10-8 Qm.) MMA m

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 67PQ

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Concept explainers

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.

Question

A high-voltage power transmission line is 200 km long, and is constructed of aluminium
cable of diameter 30 mm. What is the resistance of this length of cable? (Resistivity of
aluminium is 2.8×10-8 Qm.)

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