Electro Capacitor

Capacitors are electronic components that hold an electrical charge for an indefinite time. Different from the accumulator capacitor stores electrical charge, especially no chemical changes in the material capacitor, the magnitude of the capacitance of a capacitor is expressed in farads. Another understanding Capacitors are electronic components which can store and release electrical charge. The structure of a capacitor is made of two pieces of metal plates separated by a dielectric material. Dielectric materials are commonly known as air vacuum, ceramics, glass, and other electrolytes. If both ends of the metal plate is given voltage, the positive charges will accumulate on one leg (electrode) metal and at the same time the negative charges accumulated at the end of another metal. The positive charge can not flow toward the negative pole and the opposite end of the negative charge can not go to the ends of the positive pole, since separated by a dielectric material that is non-conductive. Electric charge is "stored" as long as there is no conduction at the ends of the legs. The ability to store electrical charge on the capacitor is named with capacitance or capacity.

The working principle of capacitors in general similar to the resistor which is also included in the passive components. Passive components are the type of component that works without requiring a bias current. The capacitor consists of two metal plates (conductors) separated by insulating material (insulator). Insulating or insulating material widely referred to as the dielectric substance.

Dielectric substance used to insulate these two components is useful to distinguish the types of capacitors. In this world there are some who use the capacitor dielectric material, such as paper, mica, liquid plastics and many other dielectric materials. In the electronic circuit, a capacitor is needed, especially to prevent electric spark jumps in the circuit containing the coil. In addition, the capacitor can also store charge or electrical energy in the circuit, can choose the wavelength of the radio receiver and a filter in the power supply (Power Supply).

Capacitors in electronic circuits function as a store of electrical current or voltage. For DC current, the capacitor can function as Isulator (retaining an electric current), while for AC current, the capacitor serves as a conductor (passing an electric current). In its application, the capacitor much in use as a filter or filter, voltage rectifiers used to convert AC to DC, AC waveform generator (insulators) and many other applications.

Types of Capacitors are divided into various. Because distinguished by its polarity, material creation and provision capacitor value. Besides having many types, shapes of the capacitor also varies. For example, large paper capacity capacitor 0.1 F, large capacity electrolytic capacitors and capacitor 105 pF large variable capacity can we change up to a maximum of 500 pF.

Prinsip Pembentukan Kapasitor Jika dua buah plat atau lebih yang berhadapan dan dibatasi oleh isolasi, kemudian plat tersebut dialiri listrik maka akan terbentuk kondensator (isolasi yang menjadi batas kedua plat tersebut dinamakan dielektrikum). Bahan dielektrikum yang digunakan berbeda-beda sehingga penamaan kapasitor berdasarkan bahan dielektrikum. Luas plat yang berhadapan bahan dielektrikum dan jarak kedua plat mempengaruhi nilai kapasitansinya. Pada suatu rangkaian yang tidak terjadi kapasitor liar. Sifat yang demikian itu disebutkan kapasitansi parasitic. Penyebabnya adalah adanya komponen-komponen yang berdekatan pada jalur penghantar listrik yang berdekatan dan gulungan-gulungan kawat yang berdekatan.

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