电子信息专业英语Unit 2.pptVIP

电子信息专业英语Unit 2 Circuits Contents Text Text Text Text Text Text Text Text Text Text Text Text Knowledge about Translation Knowledge about Translation Knowledge about Translation Knowledge about Translation Classroom Reading Classroom Reading Classroom Reading Classroom Reading Classroom Reading Company Logo * LOGO 大连理工大学出版社 Text A Knowledge about Translation B Classroom Reading C Circuits An electric circuit often consists of four parts: a source or power supply such as a battery, the conductors or wires, the control device such as a switch, and the load. The load is a device or a machine. Within the load the actual energy conversion takes place. The lamp, the resistor and the motor are common examples of electric loads. 电 路 电路通常包含四个部分：电源，如电池；导体或导线，控制器件，如开关；负载。负载是一个器件或一台机器。在负载中能够发生能量转换。电灯、电阻器和电动机都是电负载的一些普通实例。 T N power supply 电源 battery n. 电池 conductor n. 导体 wire n. 金属丝, 电线 switch  n. 开关, 电闸, 转换 load n. 负载 machine n. 机器, 机械 energy conversion 能量转换 lamp  n. 灯 motor n. 发动机, 电动机 Any combination of a conductor and a source of e.m.f. which permits electrons to travel round in a continuous stream is called an electric circuit. A lamp connected across a dry cell is an example of a simple electrical circuit. 任何有电子连续不断流动的导体和电动势源的组合都叫电路。 一盏连接干电池的灯就是一个简单电路的实例。 T N e.m.f. 电动势,是electromotive force的缩写 electron  n. 电子 dry cell 干电池 The current flows from the negative - terminal of the cell, through a lamp, to the positive + terminal, and the action of the cell is such that it provides a “regenerative” path for the flow of electrons to be maintained through the negative - terminal once again. 电流从电池的负极（－）通过电灯，流向正极（＋），电池的作用就是通过负极（－）为电子流提供一条再生通道。 T N negative terminal 负极 positive terminal 正极 regenerative  a. 再生的, 反馈的 As long as this electrical pathway remains unbroken at any point, it is a closed circuit, and the current flows. 只要电路中任何点