[Lifasa three-phase cylindrical capacitor 12.5 kilovar 440 volt code POLB44125HD](https://www.automation24.ir/product-3864/%D8%AE%D8%A7%D8%B2%D9%86-%D8% 25B3%DB%8C%D9%84%D9%86%D8%AF%D8%B1%DB%8C-%D8%B3%D9%87-%D9%81%D8%A7%D8%B2-%D9 %84%DB%8C%D9%81%D8%A7%D8%B3%D8%A7-12.5-%DA%A9%DB%8C%D9%84%D9%88%D9%88%D8%A7% 25D8%B1-440-%D9%88%D9%84%D8%AA-%DA%A9%D8%AF-polb44125hd)
Capacitor:
A capacitor is an electrical device that can store electrical charge and electrical energy, in fact, the capacitor in electrical circuits stores electrical energy in an electrostatic field, which is called the capacitive effect.
Capacitor structure:
1- Conductor plates
2- Insulation between conductors (dielectric)
Capacitors are made up of at least two conductor plates that are parallel and there is a layer of air or insulation in between. Capacitor conductor plates are usually made of aluminum, silver, and zinc, and air, paper, mica, plastic, ceramic, aluminum oxide, and tantalum oxide are used as insulating material between the plates.
## Uses :
Capacitors have a relatively wide application. Among the uses of capacitors, we can mention timing circuits along with resistors, balancing the level of direct voltage changes, and also as a filter in circuits, because capacitors easily pass alternating signals, but prevent the passage of direct signals. Considering that the electric charge is stored in the capacitor, the capacitor can also be used to create uniform electric fields. Capacitors can hold electric fields in small volumes.
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## Capacity:
Capacity is a measure of the ability to store electrical energy. High capacity means that the capacitor is able to store more electrical energy and its measurement unit is Farad. 1 farad is a big unit and it is a high capacity specification, so it is customary to use smaller units such as micro farad, pico farad and nano farad in capacitors.
## Types of capacitors:
Capacitors have a lot of variety that we describe the most important types of capacitors that are used today.
1- Variable capacitors and trimmers
2- Ceramic capacitors
3- Mica capacitors
4- Polyester capacitors
5- Paper capacitors
6- Wax and oil capacitors
7- Electrolytic capacitors
8- Tantalum capacitors
9- Mylar capacitors
### Important points in buying a capacitor:
Considering the variety of capacitors available in the market, one of the concerns of consumers is always to find a type of capacitor according to their needs, therefore, we will state some of the points that should be considered when buying a capacitor.
1- Attention to the capacity of the capacitor
2- Ability to withstand charge and discharge currents
3- Service life
4- leakage current
5- Dimensions
6- Frequency
7- Price
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