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First, the role of the capacitor and the classification capacitor (Electric capacity), consisting of two metal poles, sandwiched between insulating material (medium). The types of capacitors formed vary depending on the insulating material:
According to the structure can be divided into: fixed capacitor, variable capacitor, trimmer capacitor.
According to the dielectric material can be divided into: gas dielectric capacitor, liquid dielectric capacitor, inorganic solid dielectric capacitor, organic solid dielectric capacitor electrolytic capacitor.
Divided by polarity: there are polar capacitors and non-polar capacitors. The most common thing we get is electrolytic capacitors.
The capacitor has a blocking DC in the circuit and is used for AC coupling. It is often used for interstage coupling, filtering, decoupling, bypassing and signal tuning.
(SMD capacitor) picture provided by Dongguan Pingshang Electronic Technology Co., Ltd.
Second, the basic unit of capacitance unit capacitance is: F (method), in addition to μF (micro method), pF (pesh method), there is also a relatively small unit used, that is: nF (), because Capacitor F has a very large capacity, so what we see is generally the unit of μF, nF, and pF, not the unit of F. The specific conversion between them is as follows:
1F=1000000μF
1μF=1000nF=1000000pF
Third, the symbolic symbol of the capacitor is also divided into the domestic standard representation and the international electronic symbol representation, but the capacitance symbol is similar in both domestic and international representations. The only difference is that in the case of polar capacitors, the domestic is an empty basket. The next horizontal line, and the international is the ordinary capacitor plus a "+" symbol to represent the positive.
Fourth, the capacitor withstand voltage unit: V (volts)
Each capacitor has its withstand voltage value, which is one of the important parameters of the capacitor. The nominal withstand voltage values ​​of common non-polar capacitors are: 63V, 100V, 160V, 250V, 400V, 600V, 1000V, etc. The withstand voltage of a polar capacitor is relatively lower than that of a non-polar capacitor. The withstand voltage values ​​are: 4V, 6.3V, 10V, 16V, 25V, 35V, 50V, 63V, 80V, 100V, 220V, 400V, etc.
V. Types of Capacitors There are many types of capacitors, which can be divided into: non-polar variable capacitors, non-polar fixed capacitors, and polar capacitors. They can be divided into: CBB capacitors (polyethylene), polyester. Capacitance, ceramic capacitor, mica capacitor, monolithic capacitor, electrolytic capacitor, tantalum capacitor, etc. 
