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DC Resistance

  1. Mar 2, 2012 #1
    Hey all,

    I am looking at the American Wire Gauge chart listed on Wiki ().[/PLAIN] [Broken] I am attempting to determine how they are getting their copper resistance values.

    From my education, DC resistance is equal to [length/(conductivity*pi*radius of wire2)]. For example, if I am using #6 AWG - radius is equal to 4.115[mm], conductivity of copper is equal to 5.96e7[S/m]. This gives me 0.3154[mOhm/m], nearly four times smaller than the accepted value of 1.3[mOhm/m].

    Where am I going wrong? Thanks,

    - Satchmo05
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Mar 2, 2012 #2


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  4. Mar 2, 2012 #3
    Oh wow, that's embarrassing. Thanks for the second set of eyes. I've been staring at that very simple equation for 20 minutes and I just couldn't get anywhere. Most appreciated.
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