frequency and resistance

Discussion in 'General Electronics Chat' started by mimz_121, Jul 21, 2008.

  1. mimz_121

    Thread Starter New Member

    Jul 21, 2008
    1
    0
    can u explain to me how frquency affects the rsistance of a conductor?
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    There is a phenomenon called "skin effect." As frequency increases, the current is less in the center of the conductor and more on the surface of the conductor. The actual depth is measured at a point called "skin depth" where current density has fallen to about 0.37 of the surface current density. (Surface density = skin depth density times Euler's number.)

    Here is a chart (1/2 way down the page) which may be of interest, look at the right-most column: http://www.powerstream.com/Wire_Size.htm

    If you want to know the math, Wikipedia's article may be of help: http://en.wikipedia.org/wiki/Skin_effect
     
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