What is Capacitors Capacitors are two-terminal elements used for filtering, energy storage, voltage spike suppression, and lots of alternative applications. In their simplest form, they consist of two parallel plates separated by an insulating material called a dielectric. Capacitors store electrical charge. Capacitors Types There are several different types of capacitors Aluminium Electrolytic Capacitors Ceramic Capacitors Tantalum Capacitors Film Capacitors Polymer Capacitors I. Aluminium Electrolytic Capacitors Characteristic : aluminium Electrolytic Capacitors ar polarized, so that they can't be used with AC. They can achieve high capacitance value but with large variations, typically 20%. Applications : These are useful in applications which do not need tight tolerances or AC polarization. They are most commonly used in power supplies for decoupling purposes, i.e. to reduce voltage ripple reaching the circuit. They are additionally used wide in DC/DC ...