Re: surface area of wire

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> 

The skin depth for a plane conductor where the thickness is >> the depth is:

depth = sqrt(2/(w*permability*conductivity))  where w is the angular
frequency expressed in radians per second (2*pi*f).

Maybe this will help

Gerry R
Ft. Collins

 >
 > I'm considering winding a small test coil with litz wire. I would like to
 > know if theres a chart which states the skin depth of wire at high
frequency
 > in mm. Ive seen a chart in inches floating around though I can only get to
 > grips with mm. From what ive found 200khz is around 0.15mm skin depth. It
 > would be useful to have exact figures.
 >
 > Many thanks,
 > Chris
 >
 >