Re: Aluminum magnet wire? and Circular # 74

• To: tesla-at-pupman-dot-com
• Subject: Re: Aluminum magnet wire? and Circular # 74
• From: "Jim Lux" <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Wed, 22 Sep 1999 06:50:48 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Monday, September 20, 1999 3:23 AM
Subject: Re: Aluminum magnet wire? and Circular # 74


>Original Poster: Parpp807-at-aol-dot-com
>
>In a message dated 9/18/99 8:33:13 AM Central Daylight Time,
tesla-at-pupman-dot-com
>writes:
>
><< (It's not entirely right, but in general, doubling the diameter of the
wire
> only halves the resistance, not 1/4, as you might expect from 4 times the
> area). >>
>
>Huh?

This is in the context of skin effect, where the center of the wire carries
very little current.  For all intents and purposes, at RF, wire is a tube,
and doubling the diameter doubles the "effective" cross sectional area,
hence my comment.

Sure enough, at DC, doubling the diameter does quarter the resistance, as
shown in the copper wire tables.

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