E=IxR and Vanner [RE-wrenches]

[Jeffrey Wolfe, Global Resources]

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
>
> __________________________________________________________________
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