The hold-up capacitor voltage, while discharging, is defined by: This equation shows ... the point of view of the energy balance: which shows the amount of energy stored in the hold-up capacitor ...

Powering everything from smartphones to electric vehicles, capacitors store energy from a battery in the form of an electrical charge and enable ultrafast charging and discharging. However ...

But you get the idea. Since there is an electric field inside the capacitor, there is also energy stored in the capacitor (you can use the energy density of the electric field). So obviously ...

However, capacitors use separated electrical charges, rather than chemical reactions, to store energy. The charged particles enable energy to be stored and released very quickly.