Capacitor potential energy
The energy stored on a capacitor or potential energy can be expressed in terms of the work done by a battery, where the voltage represents energy per unit charge. The voltage V is proportional to the amount of charge which is already on the capacitor. It's expression is:
Capacitor energy = 1/2 (capacitance) * (voltage)2
The equation is:
U = 1/2 C V2
Where:
C= Capacitance
V=Voltage
