Capacitors

 Capacitors

Capacitors are also called as condensers generally used to store electric charge. The unit of capacitance is Farad(F) 

1 F               =  10,00000 microfarad

1 microfarad =  1000 nanofarad (nf) 

1 nf                   =   1000 Picofarad (pf) 

Types of capacitors

Capacitors can be divided in to fixed capacitors and variables capacitors, 

Fixed capacitors

Fixed capacitors are classified in to two categories the polarised capacitors and non polarised capacitors. Electrolytic capacitors are generally polarised capacitors. They have negative and positive poles. 

Examples of fixed capacitors

1 ceramic capacitors

2 paper capacitors

3 polyester capacitors

4 mica capacitors

5 electrolytic capacitors. 

Ceramic capacitors

These capacitors are small in size, and very cheap. Which are widely used in Electronic circuits. In this capacitor ceramic materials used as dielectric. Dielectric meas the material used in between two plates of a capacitor to separate them. SMD ( surface mound divices) type capacitors also used in various electronic equipments such as laptop. Pc mother board calculator, camera and other modern equipments.

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Polyester capacitors

Polyester materials are used as dielectric in these capacitors. Low distortion and high frequency handing capacity is the advantage of these capacitors. 

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Mica capacitors

Mica capacitors are very accurate and stable, mica is used as dielectric. Because of it's stable performance these type of capacitors are generally used in oscillator circuits. Rf filter circuits ete. 

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Paper capacitors

If dielectric used in a capacitor is paper, that capacitor is called as paper capacitor. It is made up of aluminum metal sheets and paper.

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Electrolytic capacitors

When large amount of capacitance needed, then we think about electrolytic capacitors. In these capacitors an electrolyte is used to increase  the capacitance. They have +ve and -ve terminals, so called them polarized capacitors. They also known as filter capacitors because they can reduce voltage ripples. 

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