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> Any PN junction is nothing but a variable resistor.It doesn't operate in a
> linear fashion but it is still subject to Ohm's Law.
> You'd better guess again about your statement reguarding it doesn't apply
to
> contacts between 2 corroded metal surfaces either.

In the case of most diodes, an increase of voltage beyond a certian amount
will no longer lead to a concurrent and proportional increase in
current...rather the voltage drop across the junction will not change by
much although the current will change a lot. That is not in accordance with
Ohm's law.

Although I believe that it is possible for the two corroded conductors to
function like a diode to some extent, I think it is quite likely that plasma
created at the point of connection would be the overiding current transport
mechanisim, not the corrosion itself, which would be burned through, so the
resistance would therfore change due to that. -Ken
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