On Sunday, Apr 18, 2004, at 14:58 US/Pacific, Gerhard Fiedler wrote:

>
>> Superconductors are like quantum mechanics, they don't follow the
>> rules that you are used to for other things.
>
> If that's true, then it is at least a possibility that some classic
> electric concepts like resistance are not anymore useful in that realm

Well, yes, of course.  Ohm's law doesn't apply particularly well to
anything semiconductor (except piecewise over small ranges, where it is
still useful!)  And there are lots of semiconductor devices that
exhibit regions where the meaured resistance will be negative...

BillW

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