電子專業(yè)英語(一)

1、Basic Semiconductor Crystal Structure1. DiodeWarming upRead the words and expressions.structure結(jié)構(gòu)diode二極管electronic component 子元件electrode 極semiconductor半 體anode 正極 , 陽極cathode 極 , 陰極be comprised of由 成 , 由構(gòu)成emit 出current 流light-emitting diode (LED) 光二極管ReadingA diode is a specialized electronic comp

2、onent with two electrodes called the anode and the cathode . Most diodes are made with semiconductor materials such as silicon, germanium, or selenium.There is one form of diodes which commonly used inelectronic and computer equipment, emit s visible light infrared transmission (IR) energy when curr

3、ent passes through it. Such a device is the familiar light-emitting diode ( LED) .orNotes:1. Most diodesare made with semiconductormaterialssuchas silicon, germanium, or selenium .大部分二極管由硅、鍺或硒等半導(dǎo)體材料制成。Silicon?s?l?k?n硅,硅元素 ; germanium d?:?me?ni?m鍺,鍺元素 ;seleniums?li:ni?m 硒,硒元素2. There is one form of d

4、iodes which commonly used inelectronic and computer equipment, emits visible light infrared transmission (IR) energy when current passesorthrough it. Such a device is the familiar light-emittingdiode (LED) 有一類二極管能在電流通過時(shí)發(fā)出可見光或紅外線能量，它普遍應(yīng)用于電子和計(jì)算機(jī)設(shè)備中這就是我們所熟知的發(fā)光二極管LED2. TriodeA triode is an electronic am

5、plification device having three active electrodes. The term most commonly applies to a vacuum tube (or valve in British English) with threeelements: the filament or cathode, the grid, and the plate or anode. The triode vacuum tube is the first electronic amplification device.Warming upRead the words

6、 and expressions.3. silicon-controlled rectifierWarming upRead the words and expressions.silicon-controlled rectifier可控硅整流器Layer層Device裝置Unidirectional 向的， 向性的Bidirectional雙向的，雙向性的be triggered觸 conduct傳導(dǎo)opposed to與相反，而不是direction方向positive正離子negative負(fù)離子gate electrode門電極ReadingA silicon-controlled re

7、ctifier (or semiconductor-controlled rectifier) is a four-layer solid state current controlling device.SCRs are unidirectional devices (i.e. can conduct current only in one direction) as opposed to TRIACs which are bidirectional (i.e. current can flow through them ineither direction). SCRscan be tri

8、ggered normally only by currents going into the gate as opposed to TRIACs whichcan be triggered normally by either a positive or a negative current applied to its gate electrode.Notes:1.SCRs are unidirectional devices (i.e. can conductcurrent only in one direction) as opposed to TRIACs whichare bidi

9、rectional (i.e. current can flow through them ineither direction)?？煽毓铻閱蜗騻鲗?dǎo)裝置（即僅可單向傳導(dǎo)電流），而與之相反， 三端雙向可控硅（TRIACS）則為雙向傳導(dǎo)裝置（即可雙向傳導(dǎo)電流）Feedback and Review1） Read and match（ 1）Diode（2）LED（3）TriodeSCR（ 4）2) Answer the questions:1. How many electrodes does a diode have? What are they?2. What is LED?3.4. Can SCRsbe triggered by either a positive or a negative current?3) True or false:1.All of the diodes can emit visible light or infrared transmission (IR) energy.2.3. SCRs are unidirectional devices, whill TRIACs are