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Capacitor
Presented By –Mehedy Hasan
152-33-2701
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Topic OutlineWhat is a Capacitor?Types of Capacitor
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What is a Capacitor?
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A device that stores electrons. The basic capacitor is made up of two conductors separated by an insulator or dielectric.
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Depending on how the capacitor is built, the dielectric can be made of paper, plastic, mica, ceramic, glass, a vacuum or any other such non conductive material.
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Types of Capacitor
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Non-polarized CapacitorPolarized CapacitorVariable CapacitorTrimmer Capacitor
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Non-Polarized Capacito
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Type of capacitor that can be connected any way in a circuit. There is no positive or negative. Common types of non-polar capacitors are ceramic, mica and some electrolytic.
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Polarized Capacitor
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A capacitor stores electric charge. This type must be connected the correct way round. A capacitor is used with a resistor in a timing circuit. It can also be used as a filter, to block DC signals but pass AC signals.
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Variable Capacitor
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A capacitor whose capacitance can be varied. These are usually made up of one or more moving plates and one or more non moving plates separated by the dielectric. By moving the plates, we can vary the capacitance. And it is used in a radio tuner.
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Trimmer Capacitor
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This type of variable capacitor is operated with a small screwdriver or similar tool. It is designed to be set when the circuit is made and then left without further adjustment
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