Lowest Resistivity

Thread Starter

logearav

Joined Aug 19, 2011
243
Which of the following has the lowest resistivity?
A) Copper B) Paper C) Intrinsic Silicon D) Aluminium
Revered Members,
The above question appeared in my school exam and i could not find the right answer.
Using google, i found the resistivity as follows
copper --- 1.7E-8 ohm metre
Silicon----2300 ohm metre
Aluminium --- 2.7E-8 ohm metre
But i could not get the value for paper.
Paper catches fire so easily, so i assume that paper has lowest specific resistance, though i am not sure, if specific resistance includes both thermal and electrical resistance.
I solicit the members' help for the correct answer.
 

bertus

Joined Apr 5, 2008
22,270
Hello,

Have a look at this page:
http://www.engineeringtoolbox.com/resistivity-conductivity-d_418.html

There are some formulas on the lower part of the page.

You will not find the resistvity of paper.
It is basicaly an insulator.
The resistivity of paper also depends on the humidity of the paper.

Burnt paper can be considered as carbon, but it is not paper anymore, of wich resistors are made (in a pressed form).

Bertus
 
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