Skin Effect

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 EffectCause, Formula, Resistance, Material Effect On Skin Depth, Mitigation, Examples, Skin Effect Reduction of The Self Inductance of A Conductor

Other articles related to "skin effect, effect":

Wire - Solid Versus Stranded
... the surface of the wire because of the skin effect, resulting in increased power loss in the wire ... Stranded wire might seem to reduce this effect, since the total surface area of the strands is greater than the surface area of the equivalent solid wire, but ordinary ... However, for many high-frequency applications, proximity effect is more severe than skin effect, and in some limited cases, simple stranded wire can reduce proximity effect ...
Switched-mode Power Supply - Transformer Design - Copper Loss
... (such as the line frequency of 50 or 60 Hz), designers can usually ignore the skin effect ... For these frequencies, the skin effect is only significant when the conductors are large, more than 0.3 inches (7.6 mm) in diameter ... Switching power supplies must pay more attention to the skin effect because it is a source of power loss ...
Speaker Wire - Capacitance and Inductance - Skin Effect
... Skin effect in audio cables is the tendency for high frequency signals to travel more on the surface than in the center of the conductor, as if the conductor were a hollow metal pipe ... have less overall resistance but increased skin effect ... conductor makes a difference, too silver has a greater skin effect than copper aluminum has less effect ...
Copper-clad Aluminium Wire - Skin Effect
... The skin effect causes alternating current to concentrate on the more-conductive copper cladding of the conductor, causing the resistance of the wire to approach that of ... The skin effect is also utilized in copper-clad steel wire such as RG-6 coax, which is also commonly used in high frequency applications with high strength requirements ...

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