Re: Favorite Test Questions

[trappe@physics.utexas.edu (Karl Trappe)]

Provided, of course, that you operate your "ohmic material" in its ohmic
range of behavior, ie, where R=V/I is the *linear* fit of the plot of V vs
I.  Light bulbs are ohmic as long as they are not operated as light bulbs!
Once you start getting near incandescent, the behavior is extremely
non-linear. Karl


> > Light bulb filaments are made of tungsten.  Tungsten is a metal.  Metals are
> > ohmic substances.  Ohmic substances obey Ohm's law.  What it *means* to
> > obey      etc.
>
> All very true.
>
> But in the demo of different wattage bulbs in series and parallel,
> and if you need to know the maximum transient current at startup,
> Ohm's law doesn't seem to work very well, at least to an unsophisticated
> student,  which is why I threw in the comment.
>
>
> Clarence Bennett
> Oakland University
> Rochester, Michigan
> 248 370 3418
> http://www3.acs.oakland.edu/physics/staff_info/Bennett.htm

Dr. Karl I. Trappe                              Desk Phone:  (512) 471-4152
Physics Dept, Mail Stop C-1600                  Demo Office: (512) 471-5411
The University of Texas at Austin               Home Phone:  (512) 264-1616
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