中职电子专业英语第9章教学课件

1、正版可修改PPT课件(中职）电子专业英语第9章教学课件Warming-upI.Can you point out the difference of the following pictures?II.Do you know what the following abbreviations or symbols stand for?NPN PNPIII.Talk about Current in English. And the following patterns you can use: Do you know the transistor?Could you tell me who de

2、veloped the transistor?Unit 9 Transistors下一页返回How many electrode are there?How many types of transistor?Text Comprehension TransistorA transistor is a device developed by Dr. Wm. Shockley, Dr. John Bardeen, and Dr. Walter H. Brattain, of the Bell Telephone Laboratories, making from three layers of s

3、emiconductors, i.e. NPN or PNP. The complete assembly is encased in a glass envelope or plastic block.A transistor can control the current flowing through it. It has usually three electrodes. The electrode supplying electrical charges is the emitter. The electrode collecting the charges emitted by t

4、he emitter is the collector. The third is the base.Unit 9 Transistors上一页下一页返回There are three basic connections: the common-base, the common-emitter, and the common-collector, making up various circuits. A transistor can be connected into a circuit in any one of the three ways, depending on the type

5、of operation required. Knowing the basic connections, we can easily understand all other circuits.Transistors are used for amplifying, detecting, rectifying. Oscillation and many other services performed by vacuum tubes. The word “transistor” is coined from the two words “transfer” and “resistor”. T

6、here are two types of transistors: the junction and point-contact types.Transistors dont require filament or heater elements and are ready to function when the instant voltage is applied to them. Operating voltages range from 1.5 to 30 volts DC for most applications, consuming only a few milliampere

7、s of current.Unit 9 Transistors上一页下一页返回Vocabular transistor n. 晶体管assembly n. 装配，装置electrode n. 电极collector n. 集电极emitter n. 发射极amplify v. 放大oscillation n. 震荡，震动vacuum n. 真空，真空状态coin v. 创造filament n. 细线instant adj. 瞬间的Unit 9 Transistors上一页下一页返回Phrases and expressionselectrical charge 电子电荷common-base

8、 共基极common-emitter 共发射极common-collector 共集电极Notes1. “A transistor can be operation required.”中“depending on required”引导的是状语从句。2. “The electrode collecting the chargecollector ”中“collecting the charge”是现在分词短语做“the electrode”的后置定语。I Choose the right answer from A, B, and C according to the text. 【 】1.

9、 A transistor has usually three electrodes, _ is the base. A the first B the second C the thirdUnit 9 Transistors上一页下一页返回【 】2. A transistor can connected in to a _ in any one of the three ways. A circuit B line C dot【 】3. Transistors are used _ amplifying, detecting, rectifying. A as B for C to【 】4.

10、 Operating voltages range from 1.5 to _ volts DC for most applications. A 25 B 30 C 35【 】5.A transistor can control the current flowing _ it. A under B within C thoughII True or false.1. Transistors require filament or heater elements.2. A transistor make from four layers.Unit 9 Transistors上一页下一页返回3

11、. The word “transistor” is coined from the two words “transfer” and “resistor”.4. The electrode supplying electrical charge is the collector.5.There are two types of transistor: the junction and point-contact type.III Translate the following sentences.1 There are three basic connections: the common-base, the common-emitter, and the common-collector.2. A transistor can control the current flowing through it.3.Knowing the basic connections, we can easily understand all other circuits.4.Operationg voltages range from 1.5 to 30 volts DC for most application