A capacitor is an electronic component that stores energy. The energy builds between two metal plates (positive and negative charges).
When A/C voltage is applied, a passage of energy occurs through a dielectric.
A capacitor’s dielectric is an insulation material like air, glass, ceramic, tantalum, polyester, polycarbonate, mica, oil and vacuum that separate the electrodes of a capacitor.
Capacitors can be polarized or non-polarized. Non polarized capacitors can be installed without regard to polarization. For example most aluminum electrolytic capacitors are polarized. On the other hand film capacitors are non-polarized. One should remember that capacitors are also rated for AC and DC voltage.
In general there are a few types of capacitors terminals:
The most popular tolerances are:
Tolerance ratings for capacitors can go as low as 0.1% (letter “A”) and as high as -15 + 75% (letter “U”)
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