zb10（）.docVIP

zb10（） Common symbols include: and two. 2. Common types Common capacitors: electrolytic capacitors, porcelain capacitors, polyester capacitors; In addition to these, there are also: metal capacitors, variable capacitors, dragline capacitors, air capacitors, and oil-immersed capacitors. 3. Unit of capacitance The unit of capacitance is the farad, abbreviation method: use symbol: F to express; The advance rate is: 1F = 106uF = 109nF = 1012pF 4. The normal thickness of the patch capacitor is 0.5mm, which is not marked (but the electrolytic of the patch is), and its numerical value cannot be determined from the shape. There are three types of encapsulation: 1, 1005 c 2, 2125 c 3, 3216 c 4, 1608 c The patch is also a common capacitance. It is encapsulated by a number of small capacitors. The concrete appearance is shown as below: Third, inductance The inductance is usually expressed in letters L; The international unit is Henry, or Henry, with the letter H. Its advance rate is shown as follows: 1H = 103mH = 106 mu H 1. Inductance has two characteristics: 1. The resistance to dc is very small (approximate to short circuit) and impedance to ac. 2. The inductance has the properties that prevent the current changing, so the current flowing through the inductance cannot be mutated. The classification of inductance According to the electromagnetic application principle of inductance, the inductance can usually be divided into two categories: one is the inductance coil which applies the self-inductance; A class of transformer is the application of mutual inductance. Inductance coils: fixed inductance, fine-tuning inductance and color code inductance. The recognition method of color code inductance is the same as the identification method of the color ring resistance. The first and second rings are valid bits, the third ring is the multiplier, and its unit is mu H. The basic parameters of inductance 1. Precision of inductance: the error between the actual inductance and the req