C= Q/V. So I understand that the capacitance will decrease with an increase in voltage ina circuit. Now EK also said that the V will increase with an increase in Q stating a linear relationship for the energy in a capacitor.

Can you please help me relate C of a circuit with energy.

I understand the formulae C= Q/V and

U = .5 QV; U=.5CV^2;U=Q^2/C