I'm currently enrolled in a lab class about circuits. we are doing diodes, transistors, op-amps these days. the thing is, I've never taken any circuit analysis before, but the prof. expects us to be able to understand op-amp, diodes, transistors... and be able to calculate quantities for complicated circuits involving these things. My question is what equation governs ideal transistor and op-amp? for instance, for resistor, V=IR. what about transistors and op-amps? I have searched for many books in the library (they are either too complicated or too simple to include diodes) and struggled with my book (the book is like a layman introduction to circuits... I don't like that style... the math is sketchy and derivations are usually omitted) I know for ideal transistor, current through emitter = current through collector...is that correct? what about voltage? and for op-amp... I really don't know. so for op-amp, what is the governing equations/relations regarding 1. -input 2. +input 3. output in terms of voltage and current? I just need to know the fundamental equations about these things... It will be appreciated if anyone can help me... thx for your reading.