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Author Topic: Where in a wire is the current?  (Read 1614 times)

paul.fr

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Where in a wire is the current?
« on: 23/11/2008 20:46:51 »
Does the current travel inside the wire or along the surface?


 

Offline lightarrow

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Where in a wire is the current?
« Reply #1 on: 23/11/2008 20:57:35 »
It depends if is DC or AC; inside, in the first case, along the surface (with some penetration inside) if AC; the higher the frequency in the last case, the thinner the layer.
 

lyner

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Where in a wire is the current?
« Reply #2 on: 23/11/2008 23:09:12 »
The skin depth at 50Hz is about 8mm for 60Hz AC. That means, for normal size mains voltage cables, it's all the way through.
For 1MHz frequency, the depth is just a few micro metres.
 

The Naked Scientists Forum

Where in a wire is the current?
« Reply #2 on: 23/11/2008 23:09:12 »

 

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