电子专业英语（一）.doc

Basic Semiconductor Crystal Structure1. DiodeWarming up Read the words and expressions.structure 结构 diode 二极管electronic component 电子元件electrode 电极 semiconductor 半导体anode 正极,阳极 cathode 负极,阴极 be comprised of 由组成,由构成emit发出current 电流light-emitting diode (LED) 发光二极管ReadingA diode is a specialized electronic component 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 in electronic and computer equipment, emits visible light or infrared transmission (IR) energy when current passes through it. Such a device is the familiar light-emitting diode (LED).Notes: 1. Most diodes are made with semiconductor materials such as silicon, germanium, or selenium .大部分二极管由硅、锗或硒等半导体材料制成。Silicon slkn硅,硅元素; germaniumd:menim锗,锗元素; selenium sli:nim 硒,硒元素 2. There is one form of diodes which commonly used in electronic and computer equipment, emits visible light or infrared transmission (IR) energy when current passes through it. Such a device is the familiar light-emitting diode (LED)有一类二极管能在电流通过时发出可见光或红外线能量，它普遍应用 于电子和计算机设备中这就是我们所熟知的发光二极管LED2. Triode A triode is an electronic amplification device having three active electrodes. The term most commonly applies to a vacuum tube (or valve in British English) with three elements: the filament or cathode, the grid, and the plate or anode. The triode vacuum tube is the first electronic amplification device.Warming up Read the words and expressions. 3. silicon-controlled rectifier Warming up Read the words and expressions.silicon-controlled rectifier可控硅整流器Layer 层 Device 装置 Unidirectional单向的，单向性的 Bidirectional 双向的，双向性的be triggered 触发 conduct 传导opposed to 与相反，而不是 direction 方向positive 正离子 negative 负离子gate electrode 门电极ReadingA silicon-controlled rectifier (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 whichare bidirectional (i.e. current can flow through them in either direction). SCRs can be triggered normally only by currents going into the gate as opposed to TRIACs which can be triggered normally by either a positive or anegative current applied to its gate electrode.Notes: 1.SCRs are unidirectional devices (i.e. can conduct current only in one direction) as opposed to TRIACs whichare bidirectional (i.e. current can flow through them in either direction)。可控硅为单向传导装置（即仅可单向传导电流），而与之相反，三端双向可控硅（TRIACS）则为双向传导装置（即可双向传导电流） Feedback and Review1）Read and match Diode（1） LED（2） Triode（3） SCR （4） 2) Answer the questions:1. How many electrodes does a diode have? What are they?2. What is LED?3.4. Can SCRs be 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 bid