# Resistivity of a Copper Wire

#### freddy13

1. Homework Statement

A number 12 copper wire has a diameter of 2.053mm. Calculate the resistance of a 31m long piece of such wire. Use rho=1.72x10-8 Ohm-m for the resistivity of copper.

2. Homework Equations

This is the part that I am unsure of, all of my equations for resistivity do not really have anything along the lines of the given constants, nor can I see where one is derived. If it needs to be derived from something else, please post where you get it from so I can figure it out!

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#### Dick

Homework Helper
1. Homework Statement

A number 12 copper wire has a diameter of 2.053mm. Calculate the resistance of a 31m long piece of such wire. Use rho=1.72x10-8 Ohm-m for the resistivity of copper.

2. Homework Equations

This is the part that I am unsure of, all of my equations for resistivity do not really have anything along the lines of the given constants, nor can I see where one is derived. If it needs to be derived from something else, please post where you get it from so I can figure it out!
You have a uniform cross section. Look here. http://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity

"Resistivity of a Copper Wire"

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