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<blockquote data-quote="BigWave" data-source="post: 518155" data-attributes="member: 6786"><p>bicter, you are absolutely correct. For DC, the current is uniform throughout the wire.</p><p>For AC, the skin effect increases the current density towards the outside of the conductor. This effect increases with increased frequency.</p><p>At 50Hz in copper, the skin depth (where the current has dropped to around 37% compared to the surface) is around 9.3mm, so there is no noticeable difference in current density in household ac wiring.</p><p>at 1kHz, the skin depth is around 2mm, and around 0.065mm at 1MHz. This is why Litz wire is used in better PI coils.</p></blockquote><p></p>
[QUOTE="BigWave, post: 518155, member: 6786"] bicter, you are absolutely correct. For DC, the current is uniform throughout the wire. For AC, the skin effect increases the current density towards the outside of the conductor. This effect increases with increased frequency. At 50Hz in copper, the skin depth (where the current has dropped to around 37% compared to the surface) is around 9.3mm, so there is no noticeable difference in current density in household ac wiring. at 1kHz, the skin depth is around 2mm, and around 0.065mm at 1MHz. This is why Litz wire is used in better PI coils. [/QUOTE]
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