The basic role of a capacitor is to charge and discharge. Among them, ""charging"" refers to connecting one plate of the capacitor to the positive pole of the power supply, and the other plate to the negative pole of the power supply. After charging, there is an electric field between the two plates of the capacitor, and the charging process stores the electric energy obtained from the power supply in the capacitor.
The process of causing a charged capacitor to lose its charge is called ""discharging"". For example, connect the two poles of the capacitor with a wire, and the charges on the two poles will neutralize each other, and the capacitor will release electric charge and electric energy. After discharging, the electric field between the two plates of the capacitor disappears, and the electrical energy is converted into other forms of energy.
In addition, capacitors also have the following functions: coupling, filtering, decoupling, high frequency vibration elimination, etc.
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