> Personaly I think two statements listed contradict each other.  If you
> cannot plug in two fixed values, how can you possibly ever derive the third
> value?

I'm saying something more subtle.  You can measure two
values, which are "fixed" only in that the circuit has
reached a steady state.  I'm taking into account the "real
world" effects that other posters have pointed out.

> It's only usefulll in that form when you need to derive current from a known
> voltage and resistance. Without wishing to be rude, the fact that you don't
> understand how a constant current supply can be realised means that you may
> not have fully grasped the funadmentals regarding Ohms law.  I would guess
> that you find I=V/R intuitive simply because it happens to be the form in
> which you most commonly use the law?

I don't consider it rude.  In fact, you might be the only
one who agrees with me. I guess I'm just not expressing
myself clearly enough.  You keep I constant by keeping V/R
constant, hence I=V/R!

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