Capacitors for ac applications are primarily film capacitors metallized paper capacitors ceramic capacitors and bipolar electrolytic capacitors.
Ceramic non electrolytic capacitor.
A paper capacitor is constructed of two thin tinfoil sheets which are separated by thin waxed oiled paper or.
In the aluminum electrolytic capacitor the electrodes used are made of pure aluminum.
However the anode positive electrode is made by forming an insulating layer of aluminum oxide al 2 o 3 through anodization the electrolyte solid or non solid is placed on the insulating surface of the anode.
Including ceramic capacitors monolithic capacitors polyethylene cbb capacitors and so on these non polarized capacitors are small in size low in price and good in high frequency characteristics but they are not suitable for the large capacity.
Non electrolytic capacitors can also be classified into following types.
1 1 1 1 aluminum electrolytic capacitors.
The rated ac load for an ac capacitor is the maximum sinusoidal effective ac current rms which may be applied continuously to a capacitor within the specified temperature range.
Due to their very thin dielectric oxide layer.
Non electrolytic capacitors are those capacitors which does not use a electrolyte in it s construction.
An electrolytic capacitor is a polarized capacitor whose anode or positive plate is made of a metal that forms an insulating oxide layer through anodization this oxide layer acts as the dielectric of the capacitor.
A solid liquid or gel electrolyte covers the surface of this oxide layer serving as the cathode or negative plate of the capacitor.