Q1: A copper cable is 2 km long and has across-sectional area of 10 mm?. Find its resistance at 80°C if at 20oC the resistivity of copper is 0.02×10–6 Q.m and its temperature coefficient of resistance is 0.004/•C.

Q1: A copper cable is 2 km long and has across-sectional area of 10 mm?. Find its resistance at 80°C if at 20oC the resistivity of copper is 0.02×10–6 Q.m and its temperature coefficient of resistance is 0.004/•C.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter3: Transient Heat Conduction

Section: Chapter Questions

Problem 3.4P

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

Q1: A copper cable is 2 km long and has across-sectional area of 10 mm². Find its resistance at 80°C if at 20C the resistivity of copper is 0.02x10-6 2.m and its temperature coefficient of resistance is 0.004/•C.

Q1: A copper cable is 2 km long and has across-sectional area of 10 mm². Find
its resistance at 80°C if at 20•C the resistivity of copper is 0.02×10–6 Q.m and
its temperature coefficient of resistance is 0.004/•C.

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