my book does not fare well in explanations, thus I have a few questions if the capacitor plates hold energy, how does this energy become released in certain applications? what are some common applications of capacitors? if the voltage difference in parallel capacitors are the same, why is the voltage difference in series capacitors different? why do they add up to be the overall voltage of the battery? more questions as I read more about this sorry if they're stupid questions, book sucks kinda.