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 june pdt