Two conductors that are close to each other, with a layer of non-conductive insulating medium sandwiched between them, constitute a capacitor. When a voltage is applied between the two plates of a capacitor, the capacitor will store charge. The capacitance of a capacitor is numerically equal to the ratio of the amount of charge on one conductive plate to the voltage between two plates. The basic unit of capacitance of a capacitor is Farad (F). In circuit diagrams, the letter C is usually used to represent capacitive components. Capacitors play an important role in circuits such as tuning, bypass, coupling, and filtering. It is used in the tuning circuit of transistor radios, as well as in the coupling circuit and bypass circuit of color televisions. With the rapid development of electronic information technology, the speed of updating and upgrading digital electronic products is becoming faster and faster. The production and sales of consumer electronic products, mainly flat panel televisions (LCD and PDP), laptops, digital cameras, and other products, continue to grow, driving the growth of the capacitor industry. A capacitor is a component that stores electricity and potential energy. A capacitor is a type of conductor in which a conductor is surrounded by another conductor, or the electric field lines emitted by one conductor are all terminated in the conductor system of another conductor. The capacitance formula for parallel plate capacitors: where UA UB is the potential difference between two parallel plates, ε R is the relative dielectric constant, k is the electrostatic force constant, S is the area of the two plates facing each other, and d is the distance between the two plates. Explanation: The electric field inside a parallel plate capacitor is a uniform electric field. A capacitor is different from a capacitor. Capacitance is the basic physical quantity, symbol C, and unit F (farad). The general formula C=Q/U, and the special formula for parallel plate capacitors: the electric field strength between plates E=U/d
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