Re: Aluminium aka Aluminum Wire (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 30 Sep 2007 14:43:11 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Aluminium aka Aluminum Wire (fwd)

Hi Ed, Gary,

Funny Gary that you joked about Aluminum in the UK as opposed to the US. 
You might be surprised to find the vast numbers of aluminum alloys out 
there on the market, and their conductivity (the inverse of resistivity) 
vary's greatly! Today I was adding the ability of Javatc to include 
copper or aluminum wire by simply changing the resistivity value (simply 
a check box in Javatc for Aluminum or Copper). As magnet wire is 
annealed copper, it's resistivity is well known. So, I started looking 
for aluminum magnet wire to insert a correct resistivity value and 
stumbled across an interesting table of data.

Thought I'd share since were on the subject:
http://www.edy-current.com/condres.htm

The conductivity for various aluminum allows is amazing!

Take care,
Bart

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Sat, 29 Sep 2007 17:57:37 -0700
>From: Ed Phillips <evp@xxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Aluminium aka Aluminum Wire
>
>    Just wound the following coil from #10 aluminum wire:
>
>    12 turns
>    3.5" diameter
>    3" long
>    Approximate inductance 8.45 uH
>
>F kHz      Q
>2500      375
>3000      425
>2800      465
>5000      510
>
>Measurements were made with a Heathkit Q meter [regular Boonton too 
>heavy to lift onto bench with my bad back] which seems to have an 
>accuracy of better than 10%  Wire had been sitting on a peg for several 
>years and leads weren't cleaned.  Connections via clip leads and banana 
>plugs, hardly the best..  Bottom frequency was set by capacitor in 
>meter.  I have bigger capacitors of high Q and will try to extend the 
>measurement lower at some time or other.  But I'm sure the frequency 
>doesn't change the accuracy of the comparison of aluminum and copper.
>
>    Tomorrow I'll wind the same coil with #10 copper and compare 
>results.  Expect them to be similar but a little better but not by a 
>factor of anywhere near 2..
>
>    Bottom line is that "aluminum ain't anywhere near as bad as it's 
>cracked up to be - nowhere near".
>
>    Results of other experiments welcome.
>
>Ed
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