I think Bjarney has said it all don't forget that Voltage is a unit of measurement, and it quantifies a difference in potential (the amount of stored electrons). If it makes since that the discharge of a capacitor is the release of current you are quite right. the capacitor sort of stores a charge (voltage) by storing a quantity of electrons. so in mechanical since it's pretty much the samething, but bjarneys explanation is right on and rather concise.
