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Since the capacitor is a "container" for storing electrical charges, there is the problem of "capacity" size. In order to measure the capacitor's ability to store the charge, the physical quantity of the capacitance is determined. The capacitor must be under the effect of the external voltage to store the charge. The amount of charge stored under voltage by different capacitors may vary. The international unification stipulates that when the capacitor is supplied with a 1 volt DC voltage, the amount of charge it can store is the capacitance of the capacitor, that is, the power of the unit voltage, and the letter C.
The basic unit of electrical capacity is Farah (f). Under the action of 1 volts DC voltage, if the capacitor is stored with an electric charge of 1 Coulomb, the capacitance is fixed to 1 Faraday, and the Faraday symbol F indicates the 1f 1q V. In practical applications, the capacitance of capacitors is often much smaller than that of 1 Faraday, commonly used smaller units, such as the Milli-method (MF), micro-method (Huaff), admittance (NF), skin method (PF), and so on, their relationship is: 1 micro-method equals one out of 10,000 Faraday, 1 skin method equals one out of 10,000 micro-method.