Capacitors are classified into two types:
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Polarized capacitor
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Non- Polarized capacitor
Capacitors are also classified into two mechanical groups:
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Fixed Capacitor which have fixed capacitance value.
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Variable Capacitor whose capacitance value varies.
Their are various types of capacitors.
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Ceramic Capacitors
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Film Capacitors
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Power Film Capacitors
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Electrolytic Capacitors
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Paper capacitors
Here we will be briefly introducing Electrolytic and Ceramic Capacitors:
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Ceramic Capacitor is a capacitor with fixed value and the dielectric material used is Ceramic. It is form by composition of two or more alternating layers of ceramic and metal.These capacitors are non-polarized.They are used for high stability and low losses.The capacitance value of this capacitor are stable in reference with applied voltage, temperature and frequency.
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Electrolytic capacitor are polarized capacitors. This capacitor use an electrolyte to achieve a larger capacitance than other. It’s anode or positive plate is made of a metal that forms an insulating oxide layer through anodization. A solid, liquid, or gel electrolyte covers the surface of this oxide layer, serving as the cathode or negative plate of the capacitor. these capacitors are used for filtering ans smoothing the alternating voltage.