Have you detected the doubling of the voltage of a source when connected to a capacitor? Or did you measure that double voltage at the capacitors terminals? Note that when you connect the capacitor to the source, the voltage drops to about zero and then it increases back to the voltage of the source, thing that can be easyly shown in any highschool laboratory. Your idea of double voltage would mean that between the source and the capacitor would be a continuous movement of electrical charges, if one admits that the voltage of the source stays constant while the voltage of the capacitor is the double of the source's voltage. This was never observed. Most of us did this experiment during highschool studies. (Do not invoke the small current a volt-meter takes! If one uses a modern voltmeter or electrometer, the current taken by it is quasi- insignificant!) Best regards, LL ============================================ Google "voltage multiplier".