Capacitors are used in AC circuits and pulse circuits. In DC circuits, capacitors generally play the role of blocking DC.
The AC voltage is stepped down to the proper AC voltage through a transformer.
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Electronic components are the basis for composing electronic products and mastering the types, structures, and properties of commonly used electronic components is the foundation of electronic technology.
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Passive components are components found in electronic products that consume rather than generate energy, such as resistors, capacitors, and inductors. Trillions of these common basic components are manufactured every year. They are cheap to manufacture, and can be produced using a large variety of materials. Most are general-purpose types, but some are specially designed for niche markets.