Energy Storage in Capacitor

The total work performed, and thus the total potential energy stored in the capacitor, is 

Note that the capacitance C in Equation (1.32a) is independent of charge and can be taken out of the integral [2]. Combining Equation (1.11) with (1.32a), a more familiar form of the energy stored in a capacitor can be obtained  

Ideally, the energy stored in a capacitor and capacitive charge stored by the capacitor do not leak or dissipate and are retained indefinitely until discharged [1]. However, in practice, due to the leaking of dielectric material, the self-discharge rate of the capacitor is faster relative to batteries. 

6 Capacitor Containing Electrical Circuits and Corresponding Calculation 

In general, all electric circuits are driven by an external power source such as a portable battery, supercapacitor, stationary electric generator, solar cell, or thermopile. Despite their distinct modes of operation, they all have the same principal function performing work on charge carriers while keeping a potential difference between their connected terminals. 

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Table 6.2 Maximum energy storage in capacitors after removal of doors or covers...

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