Question 47A wire with a length of 2.0 m and a diameter of 1.0 mm has aresistance of 0.45 . What is the resistivity of the material used tomake the wire?O 1.2 x 10•mO 1.8 x 107 •mO 5.6 x 107 •mO 2.8 x 1070 mNext >< Previous

Given data: Length (L) = 2.0 m Diameter (d) = 1.0 mm = 1.0×10-3 m Resistance (R) = 0.45 Ω Required:…

Answered: A wire with a length of 2.0 m and a…

A wire with a length of 2.0 m and a diameter of 1.0 mm has a resistance of 0.45 2. What is the resistivity of the material used to make the wire?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter21: Circuits And Dc Instruments

Section: Chapter Questions

Problem 30PE: Unreasonable Results (a) What is the internal resistance of a 1.54-V dry cell that supplies 1.00 W...

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Concept explainers

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.

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When a straight wire is heated, its resistance changes according to the equation R = R0 [1 + (T T0)] (Eq. 17.7), where is the temperature coefficient of resistivity. (a) Show that a more precise result, which includes the length and area of a wire change when it is heated, is R=R0[1+(TT0)][1+(TT0)][1+2(TT0)] where is the coefficient of linear expansion. (See Topic 10.) (b) Compare the two results for a 2.00-m-long copper wire of radius 0.100 mm, starting at 20.0C and heated to 100.0C.
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