Skin effect is the tendency of an alternating electric current (AC) to become distributed within a conductor such that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor. The electric current flows mainly at the "skin" of the conductor, between the outer surface and a level called the skin depth. The skin effect causes the effective resistance of the conductor to increase at higher frequencies where the skin depth is smaller, thus reducing the effective cross-section of the conductor. The skin effect is due to opposing eddy currents induced by the changing magnetic field resulting from the alternating current. At 60 Hz in copper, the skin depth is about 8.5 mm. At high frequencies the skin depth becomes much smaller. Increased AC resistance due to the skin effect can be mitigated by using specially woven litz wire. Because the interior of a large conductor carries so little of the current, tubular conductors such as pipe can be used to save weight and cost.
Read more about Skin Effect: Cause, Formula, Resistance, Material Effect On Skin Depth, Mitigation, Examples, Skin Effect Reduction of The Self Inductance of A Conductor
Famous quotes containing the words skin and/or effect:
“You flicker. I cannot touch you.
I put my hands among the flames. Nothing burns.
And it exhausts me to watch you
Flickering like that, wrinkly and clear red, like the skin of a mouth.”
—Sylvia Plath (1932–1963)
“To speak impartially, the best men that I know are not serene, a world in themselves. For the most part, they dwell in forms, and flatter and study effect only more finely than the rest.”
—Henry David Thoreau (1817–1862)