An aluminium rod with square cross section is 1.3 m long and 3.8 mm on edge) What is the resistance between its ends? The resistivity of aluminium is 2.75 - 10-8 Q.m.(ii) What must be the diameter of a cylindrical copper rod of length 1.3 m if its resistance is to be the same as that of the aluminium rod? The resistivity of copper is 1.69* 10-8 Q.m.(iii) Calculate the current (in A) and the current density (in A/m^2) of the cylindrical copper if the potential drop across the ends of the wire is 0.060 V.Select one:a. (i) 3.27 x 10-30(ii) 15.3 × 10-3 m(iii) l= 18.3 A and J=1 x 105 A/m2b. (i) 2.50 x 10-3n (i) 3.4 × 10-3 m(iii) l= 24 A and J=2.64 x 10 A/m2c. (i) 2.50 x 10-3(ii) 3.4 x 10-3 m(iii) l= 24 A and J=2.08 x 106 A/m2d. (i) 3.27 x 10-3(ii) 8.14 x 10-3 m(iii) l= 18.3 A and J=2.64 x 106 A/m2

Given Data: l=1.3mArea of the corss section = (3.8mm)2=14.44*10-6 m2ρ(AL) = 2.75 *10-8ρ(cu) = 1.69 *…

An aluminium rod with square cross section is 1.3 m long and 3.8 mm on edge (1) What is the resistance between its ends? The resistivity of aluminium is 2.75 10-8 Q.m. (ii) What must be the diameter of a cylindrical copper rod of length 1.3 m if its resistance is to be the same as that of the aluminium rod? The resistivity of copper is 1.69 - 103Ω.m. (iii) Calculate the current (in A) and the current density (in A/m^2) of the cylindrical copper if the potential drop across the ends of the wire is 0.060 V.

An aluminium rod with square cross section is 1.3 m long and 3.8 mm on edge (1) What is the resistance between its ends? The resistivity of aluminium is 2.75 10-8 Q.m. (ii) What must be the diameter of a cylindrical copper rod of length 1.3 m if its resistance is to be the same as that of the aluminium rod? The resistivity of copper is 1.69 - 103Ω.m. (iii) Calculate the current (in A) and the current density (in A/m^2) of the cylindrical copper if the potential drop across the ends of the wire is 0.060 V.

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter27: Service-entrance Equipment

Section: Chapter Questions

Problem 44R

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