中职 电子技术专业英语(双色)unit 3电子课件（）.ppt

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1、中职电子技术专业英语(双色)unit3电子课件（高教版）Electronic componentsUnit 3 Electronic componentsRead moreNew words&ExpressionUnit 3Lead-inElectroniccomponentsTask 1 Match the types of the components to the pictures:Unit 3Lead-inElectroniccomponentsresistorintegrated circuittransistorinductorcapacitordiodeUnit 3Dialogu

2、eElectroniccomponentsMy new cell phoneUnit 3DialogueA:Hey!I just bought a new cell phone!B:What does it do?A:Its got a built-in video camera so you can see the person youre talking to and use the e-mail mode to send digital pictures to your friend.B:Wow!What else does it do?A:I can plug it into a fo

3、lding keyboard to type in message mode.I can even surf the net.B:Cool!Anything else?A:Yes.With the 600-second digital memory,I can record my voice and send it using voice message mode.B.Wow!A:You can try the same one,Im sure youll love it!ElectroniccomponentsEveryday EnglishUnit 3DialogueWhat does i

4、t do?你的新手机都有些什么功能呀？你的新手机都有些什么功能呀？Its got a built-in video camera so you can see the person youre talking to and use the e-mail mode to send digital pictures to your friend.它有一个内置摄像它有一个内置摄像头，这样你在通话的时候就可以看到对方了。还可以把数码头，这样你在通话的时候就可以看到对方了。还可以把数码照片发给朋友。照片发给朋友。I can plug it into a folding keyboard to type

5、in message mode.I can even surf the net.还可以插上一个可折叠的还可以插上一个可折叠的键盘，这样就可以在短信模式下进行文字录入了。我甚至还键盘，这样就可以在短信模式下进行文字录入了。我甚至还可以用手机上网。可以用手机上网。With the 600-second digital memory,I can record my voice and send it using voice message mode.它还有它还有一个一个600秒的数字存储器，我可以把声音录下来，再通过语秒的数字存储器，我可以把声音录下来，再通过语音信息模式发给别人。音信息模式发给别人

6、。ElectroniccomponentsUnit 3ReadingElectroniccomponentsUnit 3ReadingPart 2Knowing the electronic componentsThere are a large number of symbols which represent an equally large range of electronic components.It is important that you can recognize the more common components and understand what actually

7、 they do.A number of these components are drawn below and it is interesting to note that often there is more than one symbol represent the same type of the component.ResistorsResistors restrict the flow of electric current,for example a resistor is placed in series with a light-emitting diode(LED)to

8、 limit the current passing through the LED.Fig.1 shows resistor example and circuit symbol.Resistors may be connected either way round.They are not damaged by heat when soldering.ElectroniccomponentsFig.1ResistorExampleandCircuitSymbolUnit 3ReadingPart 2Knowing the electronic componentsElectroniccom

9、ponentsCapacitorsCapacitors store electric charge.They are often used in filter circuits because capacitors easily pass AC(changing)signals but they block DC(constant)signals.Fig.2 shows capacitor examples and circuit symbol.Fig.2CapacitorExampleandCircuitSymbolInductorAn inductor is a passive elect

10、ronic component that stores energy in the form of a magnetic field.An inductor is a coil of wire with many windings,often wound around a core made fo a magnetic material,like iron.Fig.3 shows inductor examples and circuit symbol.Fig.3InductorExamplesandCircuitSymbolUnit 3ReadingPart 2Knowing the ele

11、ctronic componentsElectroniccomponentsDiodeDiodes allow electricity to flow in only one direction.The arrow of the circuit symbol shows the direction in which the current can flow.Diode are the electrical version of a valve and early diodes were actually called valves.Fig.4 shows diode examples and

12、circuit symbol.TransistorsThere are two type of standard transistors,NPN and PNP,with different circuit symbols.The letters refer to the layers of semiconductor material used to make the transistor.Fig.5 shows transistors examples and circuit symbol.Fig.5TransistorsExamplesandCircuitSymbolFig.4Diode

13、ExampleandCircuitSymbolUnit 3ReadingPart 2Knowing the electronic componentsElectroniccomponentsIntegrated circuits(chips)Integrated circuits are usually called ICs or chips.They are complex circuits which have been etched onto tiny chips of semiconductor(silicon).The chip is packaged in a plastic ho

14、lder with pins spaced on a 0.1 inch(2.54 mm)grid which will fit the holes on stripboard and breadboard.Very fine wires inside the package link the chip to the pins.Fig.6 shows integrated circuit example.Light emitting diodes(LEDs)LEDs emit light when an electric current passes through them.LEDs must

15、 be connected the correct way round,the diagram may be labelled“A”or“+”for anode and“K”or“-”for cathode.The cathode is the short lead and there may be a slight flat on the body of round LEDs.Fig.7 shows LED examles and circuit symbol.Fig.7LEDExamplesandCircuitSymbolFig.6IntegratedCircuitExampleUnit

16、3ReadingPart 2Task 2 Write T(True)or F(False)beside the following statements about the text：Electroniccomponents1One symbol represents a type of component.()2Resistors are damaged by heat when soldering.()3Capacitors are not often used in filter circuits.()4Both capacitor and inductor are passive el

17、ectronic component.()5Inductor store electric charge.()FFFTFUnit 3ReadingPart 2Task 2 Write T(True)or F(False)beside the following statements about the text：Electroniccomponents6Diodes also called valves.()8ICs are complex circuit which have been etched onto tiny chips of semiconductor.()9LEDs is on

18、e type of diodes.()7The symbol of NPN and PNP transistors is same.()10 The letter“c”represents the cathode of a diode.()TFTTFUnit 3ReadingPart 2Task 3 Match the following terms to appropriate definition or expression：ElectroniccomponentsACDCICsemiconductorA tiny“chip”containing many individual circu

19、its which work together to perform a function.A material that is neither a conductor nor an insulator.The direction of current is constant.It changes polarity periodically.Unit 3ReadingPart 2Task 4 Fill in the missing words according to the text：Electroniccomponents1.In the common components,may be

20、connected either way round.2.is a passive electronic component that store electric charge.3.Inductors store energy in the form of .4.Diodes allow electricity to flow in one .5.The of the LED is the short lead and there may be a slight flat on the body of round LEDs.resistorA capacitorA megnetic fiel

21、ddirectioncathodeUnit 3GrammarElectroniccomponentsUnit 3GrammarIt 的用法的用法It is important that you can recognize the more common components and understand what actually they do.It is interesting to note that often there is more than one symbol represent the same type of the component.1.作人称代词：作人称代词的作人称

22、代词：作人称代词的it不仅可以指物或事，也可以指人。它的主不仅可以指物或事，也可以指人。它的主要功能是指代，代替一个、词组、或整个句子，以免重复。要功能是指代，代替一个、词组、或整个句子，以免重复。Is it a boy or a girl?（指人）（指人）I dropped my watch and it broke.（指事物）（指事物）Nothing is wrong,is it?（代替某些代词）（代替某些代词）Electroniccomponents2.作非人称代词：作非人称代词：it作非人称代词，常常用作句子的主语，此时它并不指作非人称代词，常常用作句子的主语，此时它并不指代上下文中提

23、到的人或物，而是用来表示天气、日期、时间、温度、距离代上下文中提到的人或物，而是用来表示天气、日期、时间、温度、距离等。等。It is half past four now.（指时间）（指时间）It was snowing when I left.（指天气）（指天气）How far is it to your office?（指距离）（指距离）How is it going with you?（指环境或情况）（指环境或情况）Unit 3GrammarIt 的用法的用法3.作形式主语：作形式主语：it作形式主语时没有具体的意义，而只是帮助把真正的主作形式主语时没有具体的意义，而只是帮助把真正的主

24、语移到句子后部去，使句子显得平衡一些。语移到句子后部去，使句子显得平衡一些。It作形式主语时，可以代替三种作形式主语时，可以代替三种形式：不定式、动名词和主语从句。形式：不定式、动名词和主语从句。It is not right to use these places as rubbish dumps.（代替不定式）（代替不定式）It is a waste of time watching TV.（动名词短语）（动名词短语）It is a pity that the engineer couldnt come.（代替主语从句）（代替主语从句）4.作形式宾语：当不定式（短语）、动名词（短语）或从句

25、在句子中作宾作形式宾语：当不定式（短语）、动名词（短语）或从句在句子中作宾语时，为保持平衡，避免句式结构的混乱，常用语时，为保持平衡，避免句式结构的混乱，常用it作形式宾语，而将真正的作形式宾语，而将真正的宾语放在句尾。此时宾语放在句尾。此时it只起引导作用，无意义。只起引导作用，无意义。I find it interesting to be a tourist guide.（代替不定式）（代替不定式）Our teacher thinks it no good learning without practice.（代替动名（代替动名词短语）词短语）I made it clear that I

26、wasnt coming.（代替名词从句）（代替名词从句）ElectroniccomponentsUnit 3GrammarIt 的用法的用法5.用于强调句型：为了突出句子中的某一成分，达到强调或使人特别注意用于强调句型：为了突出句子中的某一成分，达到强调或使人特别注意该成分的目的，人们常常用该成分的目的，人们常常用“”句式来强调除谓语动词外的大多数句子成句式来强调除谓语动词外的大多数句子成分。如果强调的中心成分是人的话，可以用分。如果强调的中心成分是人的话，可以用that或或who来引导，否则用来引导，否则用that引导。引导。It be+被强调部分被强调部分+that/who+其他成分其他

27、成分John met Peter in Japan last year.（原句）（原句）It was John who/that met Peter in Japan last year.（强调主语）（强调主语）It was Peter whom/that I met in Japan last year.（强调宾语）（强调宾语）It was in Japan that I met Peter last year.（强调地点状语）（强调地点状语）It was last year that I met Peter in Japan.（强调时间状语）（强调时间状语）Electroniccompon

28、entsUnit 3GrammarTask 3 Read and decide.1.Mypenismissing.Icantfinditanywhere.3.itisahardjobforthepolicetokeeporderinanimportantfootballmatch.2.Itisraininghard.Electroniccomponents4.Shefounditverydifficulttoanswerthequestion.5.Itisapitythatyoudidntgotoseethemovie.作人称代词，指事物作人称代词，指事物作非人称代词，指天气作非人称代词，指天

29、气作形式主语，代替不定式作形式主语，代替不定式作形式宾语，代替不定式作形式宾语，代替不定式作形式主语，代替从句作形式主语，代替从句Unit 3GrammarTask 3 Read and decide.6.ItwasyesterdaythatItoldherthenewsatthegate.8.Itisdangerouswalkingonthinice.7.Itmustbethechildren.Electroniccomponents9.Theschoolmakesitarulethatthosewhocheatintheexamswillbeseriouslypunished.10.Itw

30、ashewhometanoldfriendintheparkyesterday.强调句型，强调时间状语强调句型，强调时间状语作人称代词，指人作人称代词，指人作形式主语，代替动名词短语作形式主语，代替动名词短语作形式宾语，代替从句作形式宾语，代替从句强调句型，强调主语强调句型，强调主语Unit 3Grammar1.Its easier _ than _.()A.say,doB.tosay,todoC.says,doesD.saying,doing2.Children find _ interesting to play computer games.()A.thatB.whichC.itD.it

31、sTask 6 Choose the best answer.3.It took the workmen only two hours to finish _ my car.()A.repairingB.repairC.torepairD.repairedElectroniccomponentsBCAUnit 3Grammar4.They are good friends._ is no wonder that they know each other so well.()A.ThisB.ThatC.ThereD.ItTask 6 Choose the best answer.5.Toms m

32、other kept telling him that he should work harder,but _ didnt help.()A.heB.whichC.sheD.itElectroniccomponentsDDUnit 3Read moreElectroniccomponentsUnit 3Read moreCapacitorElectrical energy can be stored in an electric field.The device capable of doing this is called a capacitor or a condenser.A simpl

33、e condenser consists of two metallic plates separated by a dielectric.If a condenser is connected to a battery,the electrons will flow out of the negative terminal of the battery and accumulate on the condenser plate connected to that side.At the same time the electrons will leave the plate connecte

34、d to the positive terminal and flow into the battery to make the potential difference just the same as that of the battery.Thus the condenser is said to be charged.To discharge the condenser the external circuit of these two plates is completed by joining terminals together with a wire.The electrons

35、 start moving from one plate to the other through the wire to restore electrical neutrality.ElectroniccomponentsUnit 3Read moreTask 5 This table provides the terms you need.Describe the value of these components with the help of the table:R1C1R2C2L1R3a two-hundred-and twenty-kilohm resistora five to

36、 sixty-five-picofarad variable capacitora forty-seven-kilohm resistora one-microfarad capacitora four-hundred-and-seventy-nanohenry inductora one-kilohm resistorElectroniccomponentsUnit 3Read moreTask 7 Complete the following statements with a,b,or c,score one mark for each correct answer.Electronic

37、components1.The device capable of doing this is called a capacitor or a condenser.In this sentence,what does“this”represent?a.capacitor b.electrical energyc.electrical energy can be stored in an electric field2.If a condenser is connected to a battery,the electrons will flow out of the negative term

38、inal of the battery and accumulate on the condenser plate connected to a.the negative terminal b.the batteryc.the positive terminalUnit 3Read moreTask 7 Complete the following statements with a,b,or c,score one mark for each correct answer.Electroniccomponents3.You join the two terminals of a conden

39、ser together with a wirea.When you want to discharge the condenser.b.When you want to charge the condenser.c.When you want get a high voltage.Unit 3New words&ExpressionsElectroniccomponentsUnit 3New words&Expressions symboln.符号；象征符号；象征restrictv.限制；限定；约束限制；限定；约束charge v.使充电使充电n.电荷电荷magnetica.有磁性的有磁性的

40、fieldn场地；电场场地；电场dioden.二极管二极管valven.阀，真空管阀，真空管semiconductorn.半导体半导体siliconn.硅；硅元素硅；硅元素anoden.阳极；正极阳极；正极cathoden.阴极；负极阴极；负极light-emitting diode发光二极管发光二极管AC交流电交流电New words&ExpressionElectroniccomponentsUnit 3New words&Expressions DC直流电直流电solderingn.锡焊锡焊v.焊接焊接passivea.无源的；被动的无源的；被动的energyn.能量能量coiln.线圈

41、线圈windingn.绕组绕组etchv.浸蚀浸蚀packagev.包装；封装包装；封装holdern.支持物支持物gridn.栅格栅格stripboard 带形板带形板breadboard面包板面包板condensern.电容器电容器New words&ExpressionElectroniccomponentsUnit 3New words&Expressions metallica.金属的金属的dielectricn.电解质电解质negativea.负的负的accumulatev.堆积；积累堆积；积累positivea.正的正的potential difference电位差电位差built-ina.嵌入的；内置的嵌入的；内置的plugv.插入插入foldinga.可折叠的可折叠的New words&ExpressionElectroniccomponentsUnit 3Thank you!Thank you!Electroniccomponents