Hi Ratch,

Ratch wrote:

Wait a minute, if L&M say that Ohm's law is V=IR (which it is not), and
materials that obey Ohm's law are "ohmic", then by L&M's definition, all
materials are ohmic because the resistance formula V=IR is always correct
for all materials. How is a material defined as "nonohmic"? Ratch

No, not quite, ohmic materials by definition have a current density that
is *proportional* to the electric field. Or in other words have a rho
that is a simple constant.

j = E/rho, or E = j * rho

If you have a material where rho is not a simple constant, but rather is
a function of current density, you have a non-ohmic material.

This applies to either way of writing Ohm's law, because rho and R are
proportional to each other.

So, as a result, if R is some function of I, the material is non ohmic.

There is no inconsistency.

-Chuck