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A capacitor, usually referred to as its capacity to hold charges, is expressed in the letter c. Definition 1: a capacitor, as its name implies, is a 'container for charging', a device that holds charges. English name: capacitor. Capacitor is one of the widely used electronic components in electronic equipment. It is widely used in intersecting, coupling, bypass, filtering, tuning loop, energy conversion, control and so on. Definition 2: capacitors, any two insulated and closely spaced conductors (including conductors) that form a capacitor. Capacitors are different from capacitors. The capacitance is the basic physical quantity, the symbol is c, and the unit is f (Farah).