At 20°C, a 7.5 m long copper wire has a cross-sectional diameter of 1 mm. If 15 A of current flow through the wire, what is the potential difference (in V) of the wire at 20°C? Pcopper = 1.68x10-8 0 m acopper = 0.0039 /C°

At 20°C, a 7.5 m long copper wire has a cross-sectional diameter of 1 mm. If 15 A of current flow through the wire, what is the potential difference (in V) of the wire at 20°C? Pcopper = 1.68x10-8 0 m acopper = 0.0039 /C°

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 49P: Taking R = 1.00 k and = 250 V in Figure P21.49, determine the direction and magnitude of the...

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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.

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At 20°C, a 7.5 m long copper wire has a cross-sectional diameter of 1 mm. If 15 A of current flow through the wire,
what is the potential difference (in V) of the wire at 20°C?
Pcopper = 1.68x10-8 0-m
dcopper = 0.0039 /C°

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