An 18-gauge copper wire (ρ = 1.230 X10 -6Ωm) has a diameter of 1.02 mm. It carries a current of 1.67 A. Find (a) the potential difference between two points in the wire 50m apart; (b) the resistance of a 50m length of this wire.

An 18-gauge copper wire (ρ = 1.230 X10 -6Ωm) has a diameter of 1.02 mm. It carries a current of 1.67 A. Find (a) the potential difference between two points in the wire 50m apart; (b) the resistance of a 50m length of this wire.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 8P: A 0.900-V potential difference is maintained across a 1.50-m length of tungsten wire that has a...

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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

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An 18-gauge copper wire (ρ = 1.230 X10 ^-6Ωm) has a diameter of 1.02 mm. It carries a current of 1.67 A. Find (a) the potential difference between two points in the wire 50m apart; (b) the resistance of a 50m length of this wire.

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