Why are resistors good?
limit current flow..., i.e. in a RC circuit. Capacitor has a certain amount of charge that it will discharge, but resistor tells how much charge can go through at a time. not all bad.
RC time constant
no such thing as a free lunch... but no such thing as a lost lunch, either! if you paid for it, it's there... if you can't find it, it's because someone stole it
