NNTP-Posting-Date: Mon, 06 Jan 2003 09:55:52 -0600
From: firstname.lastname@example.org (John Fields)
Subject: Re: Reducing contact resistance for low volt use?
Date: Mon, 06 Jan 2003 15:20:41 GMT
Organization: Austin Instruments, Inc.
References: <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
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On Mon, 06 Jan 2003 15:08:02 GMT, DarkMatter
>On Mon, 06 Jan 2003 14:00:10 GMT, email@example.com (John Fields) Gave
>>On Mon, 06 Jan 2003 12:05:06 GMT, DarkMatter
>>> Ohms per foot is ohms per foot. Silver is a better conductor than
>>>copper. AC or DC. If you are trying to garner every little bit, how
>>>could it be negligible?
>>If the silver plating reduced the resistance of the wire by less
>>than 1% of the resistance of the unplated copper, then I'd call that
>>I invite you to post the difference in resistance between, say one
>>foot of 24AWG soft-drawn copper wire at 25?C and one foot of 24 AWG
>>oxygen-free high-conductivity silver-plated soft-drawn copper wire
>>at 25?C so that we can have some quantitative data to work with.
> So, from your assertion, there is no difference.
No, you must have misunderstood. There will _obviously_ be a
difference, for the reasons that you stated earlier. My point is
that the _difference_ is probably negligible.
> So, you are saying that the military uses it for no reason at all?
I don't believe I made any mention of the reason the military uses
it all. However, if you'd like to start a thread on that subject
I'd be glad to join in.
> Also, at 100A, that 24Ga wire in either style won't last long enough
I didn't say that the 24AWG would be used to pass 100A, I was only
suggesting that it be used to do an apples with one kind of skin
-to-apples with a different kind of skin comparison. I was also
giving you a break, because the percentage of resistance decrease of
one foot of #24 is going to be quite a bit larger than the same
length of #0 for the same thickness of silver plating.
If you want to, pick a wire size which can pass 100A and do the
comparison. Make it easy on yourself and make it a cable stranded
with small gauge wire.
> Also, if it is better than 1% at 1000 feet, what makes you think it
>wouldn't be better at one foot?
If it's 1% better at 1000 feet it will be 1% better at one foot
also. Or one inch. Or whatever.
> Another thing. If you want your sig to work properly in
>newsreaders, you need to put only TWO dashes at the beginning of the
>line. Three negates the entire purpose as it is non-functional.
It comes through fine when I read it on this end with either Agent,
Netscape, or OE, or from a couple of different ISP's, so the problem
must be on your end. Not surprising.
Professional circuit designer