skin-effect

skin effect

noun Electricity.
the phenomenon in which an alternating current tends to concentrate in the outer layer of a conductor, caused by the self-induction of the conductor and resulting in increased resistance.

Origin:
1895–1900

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
skin effect
 
n
the tendency of alternating current to concentrate in the surface layer of a conductor, esp at high frequencies, thus increasing its effective resistance

Collins English Dictionary - Complete & Unabridged 10th Edition
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Skin-effect is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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