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Capacitors - School Essays

Capacitors

A device for storing an electrical charge is called a capacitor or electrical condenser. in their simplest form consist of two metal plates, which are separated by a nonconducting layer called the dielectric. As one plate gets charged with a direct- current such as a positive charge, the other plate will be charged with the opposite sign such as a negative charge. The larger the capacitor, the more electrically charge it can absorb. are limited to the amount of electrical charge, but they function well as conductors in alternating- current circuits. One example of this is called the Leyden jar, which has the two plates that are coated with a metal- foil on both sides. The coated ...

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large, but the energy loss in the dielectric must be very small. Some applications for these are in radio- frequency circuits and low- frequency measuring circuits where great precision is required. Another type of capacitor uses castor or mineral oil for the dielectric. Oil insulated are used in applications where larger values of the capacitance are required. also use solid dielectrics such as films of synthetic materials, paper, glass, and mica. Mica has excellent properties as a dielectric. It is both high in its dielectric constant and insulation resistance. It is affected little by time and temperature. This time of capacitor is used in laboratories because of their stability and the relatively high values of capacitance for a given volume.
A type of capacitor that doesn't fall into one of those groups is an electrolytic capacitor, which has an oxide film formed on aluminum. This film is the dielectric and is very thin. This form of has a certain limitation. The ...

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PAPER DETAILS

Added: 7/9/2006 05:48:01 PM
Category: Science & Nature
Type: Premium Paper
Words: 504
Pages: 2

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