Re: R = V/I ?

[Mark Sylvester <msylvest@SPIN.IT>]

At 12.59 05/05/00 -0500, Richard W. Tarara wrote:
> ----- Original Message -----
> From: "Mark Sylvester" <msylvest@SPIN.IT>
> >
> > Hmmm... what, then, is the quantitative definition of R?
> >
> > Mark
>
> For a uniform material, I would use:
>
> R = Resistivity x Length/ (Cross Sectional Area)
>
> where the Resistivity = (Temperature normalized Resistivity)(1+alpha x
> deltaT)
>
> alpha being a measured/cataloged coefficient and deltaT measured from the
> normalization Temp (often 20C).
>
> For a complex object, the resistance is a parallel/series combination of
> these terms depending on the materials and the construction.  Again, V/I can
> functionally give you a _measure_ of the resistance of such an object, but
> doesn't (in my mind) define that resistance.



... and the "Temperature normalized Resistivity" is defined without using
the concept of resistance or its equivalent?

Mark.



_____________________________________
Mark Sylvester
United World College of the Adriatic,
34013 Duino TS, Italy.
_____________________________________