A copper wire with diameter 2.588 mm, can safely carry currents up to 30.0 A. (a) What is the resistance of a 100-m length of the wire? (b) How long does it take for an electron to travel 100 m in the wire when the current is 30.0 A? The electron density of copper is 8.47×1028 m-3.

A copper wire with diameter 2.588 mm, can safely carry currents up to 30.0 A. (a) What is the resistance of a 100-m length of the wire? (b) How long does it take for an electron to travel 100 m in the wire when the current is 30.0 A? The electron density of copper is 8.47×1028 m-3.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 31P: Consider a wire of a circular cross-section with a radius of R = 3.00mm. The magnitude of the...

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

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