I have a question for you guys about reading from the book and to what percent of that is actually needed everyday... What i mean by this is, if i read a chapter say on relays or magnetism.. Actually we read magnetism first then relays. But anyways, what i mean is, i read magnetism out of that chapter am i supposed to know that chapter or just the basic concepts of magentism.. Meaning not that we have to know all the definitions and everything about magnetism but the simple facts of the mechanics and how this is implied in relays, as to why and how it works correct????