Copper has a resistivity of 1.7 x 10-º0 m. A wire of diameter 1.5 mm and length 25 m is connected across a potential difference of 50 V. Calculate: (a) The resistance of the wire (b) The current (c) The power dissipated in the wire

Copper has a resistivity of 1.7 x 10-º0 m. A wire of diameter 1.5 mm and length 25 m is connected across a potential difference of 50 V. Calculate: (a) The resistance of the wire (b) The current (c) The power dissipated in the wire

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 67PQ

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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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estion 7 of 11
Copper has a resistivity of 1.7 x 10 Q m. A wire of diameter 1.5 mm and
length 25 m is connected across a potential difference of 50 V.
Calculate:
(a) The resistance of the wire
(b) The current
(c) The power dissipated in the wire
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