Trying to learn the basics of capacitors, but I'm hung up on a conceptual issue. It seems that capacitors must be charged up, generally with the help of a current from outside the capacitor, such as a flow of electrons that pile up on one of the plates. So in that sense, the capacitor must be storing, in this case negative, charge, at least on one of the plates. Yet it also seems that capacitors, at least once charged, are described in terms of two conductors with equal opposite charge, thus having no net charge. My question is essentially: does the capacitor, taken as a closed system, have net charge? If not, then how is charge conserved when so much negative charge was added to the capacitor to charge it up? Any help on this would be greatly appreciated, as I'm sure there is a flaw somewhere in my conception of a capacitor and how it works.