Resistance and Ohm's Law 

Ohm's law could be viewed as the definition of a fixed resistor.  In that case, impedance "generalizes" Ohm's law.  If Ohm's law is a behavioral relationship then it says things like V(t)/I(t) = R for any ideal voltage or current source, not must sinusoidal AC.  Because it is called a "law," I have always thought Ohm's law referred to a behavioural relationship, otherwise it would be called Ohm's definition.  But maybe I am confused.   08:54, 26 June 2007 (PDT)