> > But aren't R and V the only two of the three variables
> > that you can manipulate directly?
>
> No, not really.  There is a current source in the EE lab
> that maintains a set current regardless of voltage or
> resistance (within reason).  I think ordinary
> transistors do this to some extent also, as they are
> current amplifying devices.

I think I'm getting in over my head here (I'm not an EE).
Could you elaborate on how you can produce current, and
how you can do so keeping R and V constant?  So in other
words, are you saying Ohm's law does not apply in certain
cases?

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