Lowest Resistivity

Discussion in 'Physics' started by logearav, Mar 8, 2012.

  1. logearav

    Thread Starter Member

    Aug 19, 2011
    248
    0
    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.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    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
     
    logearav likes this.
  3. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    If you get the metals cold enough the metals can be superconductors. :p
     
    logearav likes this.
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