Does Wire Length Affect Resistivity in Electrical Conductors?

[ImStress]

Homework Statement

A length of aluminium wire having a cross-sectional area of 6 cm2 has a resistance of 6 Ω at a given temperature. Given the resistivity of aluminium is 5 x10-8 Ω-m, calculate the length of the wire in meters. (keep two decimal places)

Relevant Equations

R=Pl/A

L=Ra/P
=6x0.0006/5x10^-8
=72000

 

[scottdave]

Your calculation looks correct. The answer should have units on it. What is your question?
If you think it is too big, think about the size of a 6 square centimeter circle (cross section)