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Types of capacitor
A capacitor (formerly known as a condenser, and prior to that known as a permittor) 〔Terrell Croft "Library of Practical Electricity"(1917)〕 is a passive two-terminal electrical component that stores electric energy in an electric field. The forms, styles, and materials of practical capacitors vary widely, but all contain at least two electrical conductors (called "plates") separated by an insulating layer (called the dielectric). Capacitors are widely used as parts of electrical circuits in many common electrical devices.
Capacitors, together with resistors, inductors, and memristors, belong to the group of "passive components" used in electronic equipment. Although, in absolute figures, the most common capacitors are integrated capacitors (e.g. in DRAMs or flash memory structures), this article is concentrated on the various styles of capacitors as discrete components.
Small capacitors are used in electronic devices to couple signals between stages of amplifiers, as components of electric filters and tuned circuits, or as parts of power supply systems to smooth rectified current. Larger capacitors are used for energy storage in such applications as strobe lights, as parts of some types of electric motors, or for power factor correction in AC power distribution systems. Standard capacitors have a fixed value of capacitance, but adjustable capacitors are frequently used in tuned circuits. Different types are used depending on required capacitance, working voltage, current handling capacity, and other properties.
== General remarks ==
''Capacitors are a good example of the fact that even the simplest device can become complicated given 250 years of evolution.''〔J. Ho, T. R. Jow, S. Boggs, (Historical Introduction to Capacitor Technology )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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