Re: Ohm's Law

[Bernard Cleyet <anngeorg@PACBELL.NET>]

Harnwell "says", in that first paragraph, metals and the great majority of
other solid conductors and to a good approximation electric conduction in
liquids follow this (ohm's -- J(volume) = sigma E) law.  The major exception
is gaseous conduction.

This is either a repetition or déjà vu of a previous bc post -- I also
remember specifically MS's W - lamp post.

Of course every thing and nothing is ohmic depending on the range of
measurement -- I think this has something to do with the General Mean-value
Theorem (Taylor's) and well behaved functions.

Mark Sylvester wrote:

> Interesting to see the evolution of consensus on this topic. In its
> previous incarnation (inverbation?) on this list (when I brought it up) the
> view was that the filament lamp is a non-ohmic *device* even if the
> tungsten wire is an ohmic conductor.
>
> Mark
>
> Mark Sylvester
> UWCAd
> Duino Trieste Italy