Skin effect facts for kids
Skin effect is the tendency of an alternating electric current to flow towards the perimeter of a conductor and leave the center part of the conductor without (or barely) any electricity flow.
Images for kids
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Induction cookers use stranded coils (Litz wire) to reduce heating of the coil itself due to the skin effect. The AC frequencies used in induction cookers are much higher than standard mains frequency ‒ typically around 25-50 kHz.
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Current density in round wire for various skin depths. Numbers shown on each curve are the ratio of skin depth to wire radius. The curve shown with the infinity sign is the zero frequency (DC) case. All curves are normalized so that the current density at the surface is the same. The horizontal axis is the position within the wire with the left and right extremes being the surface of the wire. The vertical axis is relative current density.
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The internal component of a round wire's inductance vs. the ratio of skin depth to radius. That component of the self inductance is reduced below μ / 8π as the skin depth becomes small (as frequency increases).
See also
In Spanish: Efecto pelicular para niños
