It is easy to assume, when wrestling with electronic design, that the active devices will cause most of the trouble. This, like so much in electronics, is subject to Gershwin’s Law: it ain’t necessarily so. Passive components cannot be assumed to be perfect, and while their shortcomings are rarely discussed, they are all too real. In this chapter I have tried to avoid repeating basic stuff that can be found in many places, to allow room for information that goes deeper.
Normal metallic conductors, such as copper wire, show perfect linearity for our purposes, and as far as I am aware, for everybody’s purposes. Ohm’s Law was founded on metallic conductors after all, not resistors, which did not exist as we know them ...