frequency and resistance

thingmaker3

Joined May 16, 2005
5,083
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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