Re: electron mass in an electrical circuit
From: Bilge (dubious_at_radioactivex.lebesque-al.net)
Date: 11/09/04
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Date: Tue, 9 Nov 2004 09:44:57 +0000 (UTC)
robert bristow-johnson:
>in article ab2dc45b.0411051504.6a62d054@posting.google.com, Igor Khavkine at
>igor.kh@gmail.com wrote on 11/06/2004 12:07:
>
>> dvdctlr@tiscali.co.uk (Dave Cutler) wrote in message
>> news:<dada93ec.0411042005.5bd47460@posting.google.com>...
>>> This thread is very likely to be badly misinformed but anyway here
>>> goes...
>>>
>>> In an electrical circuit electrons travel at a significant
>>> proportion to the speed of light,
>>
>> Wrong. The speed of electrons is on the order of centimeters per second.
>
>okay guys,
>
>what is meant, when referring to a transmission line data sheet, that the
>velocity factor is 0.78 . what is it that is moving at 0.78 c?
The signal. Note that the speed of propagation depends on the dielectric.
>when we electrical engineers design circuit boards for high speed devices
>(something i must admit i have never done), we often consider 1 foot of
>distance to be about a nanosecond of delay. i know that could be off by a
>factor of 2, but i doubt it's off by a factor of 10. what is it that is
>moving along those PC board traces?
The signal, i.e., the fields.
>nonetheless, since the electrons are not moving at 0.999 * c, they are not
>going to get appreciably heavy and since their rest mass is 1800 times less
>than that of protons or neutrons, there is no relativistic arithmetic i can
>think of that makes their mass appreciable.
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