I understand what resistors are, what they do and how to choose one(R=V/I) for say an led. Where I get confused when looking at circuits is with all these resistors is how exactly do you know which value to choose? I've noticed 220, 1k, 10k and 100k seem to be used alot. Are these like beginning values and you tweak them from there? How do you decide the right resistor when working with ICs and tying switches to them or putting this certain resistor in front of the base of a BJT or you need this certain resistor here to keep this output LOW then when current is added etc, etc, etc. This is where my head starts spinning.
Any help in explaining it so I can understand this better?
Any help in explaining it so I can understand this better?