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At 11.38 05/05/00 -0700, Leigh Palmer wrote:
I've never considered R = V/I to be anything so general as the
definition of a physical quantity. It is the definition (with
Ohm's law implicit) of a parameter which we call the resistance.
This parameter may apply to many two-terminal devices, notably
to resistors, and it is inappropriate to apply it to devices
which do not obey Ohm's law.
He has just recently made a strong case for considering a lightbulb to be
"a device which does not obey Ohm's law". It seems to follow that it is
inappropriate to speak of the electrical resistance of a lightbulb. This
seems to be an idiosyncratic position to take, and I'm interested to see
how he will extricate himself from this corner.