The Capacitors

A capacitor is an electronic component that stores energy in the electric field created between a pair of conductors on which equal but opposite electric charges have been placed. Capacitors are used for a variety of purposes including signal coupling, motor starting, energy storage, power factor correction, voltage regulation, tuning, resonance and filtration. Capacitors are energy storage devices that are commonly used to supply these energy bursts by storing energy in a circuit and delivering the energy upon timed demand. A capacitor stores a charge and then supplies the charge required for the operation of a electrical device, such as audio amplifiers, surge protectors, power supplies, switching regulators, motor control regulators, computer electronics, and resistance spot welders. These electrical devices often require substantial bursts of energy in their operation. Microelectronic capacitors are becoming increasingly important in microelectronic devices. Microelectronic capacitors have been widely used in integrated circuit memory devices, such as dynamic random access memory (DRAM) devices. A capacitor is typically made of two parallel surfaces or plates, each of which is an electrode. In order to obtain a high capacitance, a large dielectric surface area is used, the dielectric may be a gas, liquid, solid, or vacuum.

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