《Lesson03ResistorCapacitorInductor电子技术专业英语教程.pptVIP

《电子技术专业英语教程》 Unit 2 Semiconductor device Lesson 3 Resistor Capacitor Inductor 《电子技术专业英语教程》冯新宇 主编 电子工业出版社 Lesson 3 Resistor Capacitor Inductor Terminology Resistor Capacitor Inductor Four-band resistors Inductance formulae Terminology 电阻可以被认为对电流具有一种阻碍作用，电阻越高所流过的电流越低 。 The resistance of an electrical conductor depends on 4 factors, these being: (a) The length of the conductor. Resistance, R, is directly proportional to length, l, of a conductor, i.e. R∝l. (b) The cross-sectional area of the conductor. Resistance, R, is inversely proportional to cross-sectional area, a, of a conductor, i.e. R∝1/a. (c) The type of material. (d) The temperature of the material. Resistor 导体的电阻依赖以下四个因素： （a）导体长度。电阻R正比于导体长度l，即R∝l （b）导体横截面积。电阻R反比于导体的横截面积a，即R∝1/a （c）材料类型 （d）材料温度。 The main types of the capacitor include: variable air, mica, paper, ceramic, plastic, titanium oxide and electrolytic. 电容的主要类型包括：可变间隙电容，云母电容，纸电容，陶瓷电容，塑料电容，二氧化钛电容以及电解质电容。 An iron-cored inductor is often called a choke since, when used in a.c. circuits, it has a hoking effect, limiting the current flowing through it. 一个有铁芯的电感器我们通常把它称之为扼流圈，这主要是因为在交流电路中它具有阻塞效应，可以限制流过它的电流。 Four-band resistors Four-band identification is the most commonly used color-coding scheme on resistors. It consists of four colored bands that are painted around the body of the resistor. The first two bands encode the first two significant digits of the resistance value, the third is a power-of-ten multiplier or number-of-zeroes, and the fourth is the tolerance accuracy, or acceptable error, of the value. The first three bands are equally spaced along the resistor; the spacing to the fourth band is wider. Sometimes a fifth band identifies the thermal coefficient, but this must be distinguished from the true 5-color system, with 3 significant digits. For example, green-blue-yellow-red is 56×104?Ω = 560?kΩ?±?2%. An easier description can be as followed: the first band, green, has a value of 5 and the second band, blue, has