qqp question1: A capacitor is charged by an 8V battery. When 1 C passes through the capacitor, it goes through the first plate with 8 J  and comes out of the second plate with 0 J. Does this mean that if we connect a voltmeter to the capacitor it will read a potential difference of 8 V just because of 1 C of charge? question2: How do I memorize the formulas in physics?