I am not sure if I have full understanding of capacitors energy, because I found a contradiction in solving one problem. The problem is: - If an uncharged capacitor connected to another fully charged capacitor in parallel, what will be the new charge distribution on both capacitors? “Assuming equal capacitance” I believe we have two rules of respect:- 1- Conservation of charge 2- Conservation of energy If we assume that C = capacitance, and Vi = initial voltage and Qi=the initial charge on the charged capacitance. Let the energy before connecting the two capacitance equal to the energy after linking them together:- 0.5*C*Vi^2 = 0.5*(2C)*Vf^2 then: - Vf=Vi/sqrt(2) Know consider the total charge after linking both capacitors:- Qt = Ct * Vf= (2C)*Vi/sqrt(2)=C*Vi*sqrt(2) Which is obviously not equal to C*Vi “the initial charge”. I am confused which one of these two fundamental concepts I have to base my calculation in, and why it doesn’t work with the other concept.