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Date:         Sat, 16 Jun 2018 12:25:30 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Electrical puzzle
Comments: To: OlRivrRat <OlRivrRat@comcast.net>
In-Reply-To:  <236DDB3F-D9AA-417E-82EF-7E81330D64B8@comcast.net>
Content-Type: text/plain; charset="UTF-8"

>
> "There is a wearout mechanism in metal called electromigration. The failure
> typically relates to high current (electrons) moving metal atoms resulting
> in
> voids (missing metal atoms or a hole in the metal line). This failure
> typically
> appears close to the contact area and not in the middle of a wire."
>


If you read the next answer down on Quora, he points out that
electromigration is an issue in integrated circuits, where current density
may be 100,000 amperes per cm^2 -- not in a car wire with density of less
than one ampere per cm^2.


Yrs,
d
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