A resistor is constructed of a carbon rod that has a uniform cross-sectional area of 5.00 mm². When a potential difference of 15.0 V is applied across the ends of the rod, the rod carries a current of 4.00 x 10³ A. Find (a) the resistance of the rod and (b) the rod's length.

A resistor is constructed of a carbon rod that has a uniform cross-sectional area of 5.00 mm². When a potential difference of 15.0 V is applied across the ends of the rod, the rod carries a current of 4.00 x 10³ A. Find (a) the resistance of the rod and (b) the rod's length.

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 65PQ

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Concept explainers

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.

Question

A resistor is constructed of a carbon rod that has a uniform cross-sectional
area of 5.00 mm². When a potential difference of 15.0 V is applied across
the ends of the rod, the rod carries a current of 4.00 x 10-³ A. Find (a) the
resistance of the rod and (b) the rod's length.

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