A certain copper wire has a resistance of 25 ohms at 10°C. Take the temperature coefficient at 10°C to be 0.00409 deg/C. What must be the maximum operating temperature of the wire if its resistance is to increase by at most 20%?

A certain copper wire has a resistance of 25 ohms at 10°C. Take the temperature coefficient at 10°C to be 0.00409 deg/C. What must be the maximum operating temperature of the wire if its resistance is to increase by at most 20%?

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Current And Resistance

Section: Chapter Questions

Problem 27.73AP

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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

3. A certain copper wire has a resistance of 25 ohms at 10°C.
Take the temperature coefficient at 10°C to be 0.00409
deg/C. What must be the maximum operating temperature
of the wire if its resistance is to increase by at most 20%?

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