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Topic:Kt Kingtronics Capacitors
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Capacitors are devices which store electric charge. They are usually made from two parallel metal surfaces with some insulating dielectric layer between them. If one of the plates is charged, and the other is grounded, opposite charges will accumulate on it by influence, while the net charge stays zero. The capacitance is the magnitude of charge on one plate Q divided by the voltage V across the plates. The unit of capacitance is the farad. 1 F = 1As/VThe capacitance of two parallel metal plate of area A and d distance apart (supposed that the lateral sizes of the plates are much bigger than the distance between them) is where e is called the permittivity of the insulating material between the plates.The permittivity of vacuum is e0 = 8.85 ×10-12 As/(Vm).The capacitance can be increased by applying high permittivity material between the metal plates, like paper, plastic, oil, mica, or ceramic. Typical capacitance values range from about 1 picofarad (pF, 10-12 F) about
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