E=IxR and Vanner [RE-wrenches]

[Joel Davidson]

You got it, Jeff. Resistivity is a very important aspect of PV cell
manufacturing but rarely (never to my recall) mentioned in system design.

"Jeffrey Wolfe, Global Resources" wrote:

> OK,
>
> I got out the book. Mark's Handbook (granted, this is an M.E. handbook)
> defines "Resistivity" as "the resistance of a sample of material having
> both a length and cross section of unity." Basically meaning that it's the
> unit resistance, (or inverse of the conductivity). So the "resistivity" is
> a raw material property, independent of shape and size, and "resistance" is
> a finished product property (be it a wire, group of wires, battery, etc.,
> it's a material in some form.)
>
> Clear as mud, and putting up resistance - Jeff
>
> On Tuesday, September 11, 2001 1:12 AM, William Miller
> [SMTP:wrmiller at slonet.org] wrote:
> > At 11:08 PM 9/10/01 -0400, you wrote:
> > >Actually, isn't it "resistivity" that stays constant? Actual resistance
> > >decreases (i.e. at less current flow there is less voltage drop.) And
> yes,
> > >environmental factors do need to remain constant....
> > >
> >
> > Resistivity, that's a new one on me.  I've spent a good deal of my career
> > working Ohm's law and it's my experience that resistance is a physical
> > attribute that does not change except with physical changes to the device
> > (heat or dimensions).
> >
> > William
> >
> > __________________________________________________________________
> > William Miller
> > SLO Communications: Communications and Power Systems Consulting
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