A CDE Definition
With alternating current (AC), electrons flow more at the outer surface of the wire rather than through the middle. The higher the frequency, the more the skin effect and the greater the resistance. Stranded wire produces less skin effect than solid, because there is more surface area. The skin effect enables copper-clad steel wire to be used. The steel adds cable strength, and the current flows mostly through the better-conducting copper. See also skin.
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