电梯专业英语课件09---电气系统PPT文件格式下载.pptx

1、,YOUR SITE HERE,Whats electrical circuit?什么是电 路Electrical circuit consists of a source of electrical energy,some sort of load to make use of that energy,and electrical conductors connecting the source and the load.电路包括电源，消耗能量的负载及连接电源和 负载的导体。,YOUR SITE HERE,Electrical Circuit电路,Types of Circuits 电路种类

2、,YOUR SITE HERE,the series circuit the parallel circuit,串联电路 并联电路,the series-parallel circuit串并联电路,Electrical Circuit电路,Electronic Component 电器元件,Diodes二极管,YOUR SITE HERE,Electronic Component 电器元件,YOUR SITE HERE,Most diodes are similar in appearance to a resistor and will have a painted line on one

3、end showing the direction or flow（white side is negative）.大多数二极管在外观上与电阻相似，在一端的漆 线表示方向或流向（白色一侧是负极）,Electronic Component 电器元件,YOUR SITE HERE,Light-emitting Diode发光二极管（LED）lower energy consumptionlonger lifetimerobustnesssmaller size能耗低，寿命长，鲁棒性好，尺寸小,Electronic Component 电器元件,YOUR SITE HERE,Electronic C

4、omponent 电器元件,YOUR SITE HERE,Transistors三极管A transistor can control its output in proportion to the input signal.That is,it can act as an amplifier.三极管可以根据输入信号成比例地控制其输出 信号。也就是说，它可以作为一个放大器。,Electronic Component 电器元件,YOUR SITE HERE,Resistors“resist”the flow of electrical current.电阻会阻碍电流的通过。The higher

5、the value of resistance the lower the current will be,with the voltage being constant.电压不变时，电阻值越大，电流越小。,Electronic Component 电器元件,YOUR SITE HERE,A capacitor functions much like a battery,but charges and discharges much more efficiently.电容的作用类似于电池，但充放电的效率更高。Single chip microprocessor is a complete co

6、mputer system integrated on a single chip.单片机是集成在一个芯片上的完整计算机系统。,terminal（lead）diode（LED）transistorcapacitor/capacitancerelayvoltage/current/resistantmicrocontroller unitinductor/inductanceanode and cathode/positive and negative,New word（新单词）,端子二极管（发光二极管）晶体管电容继电器电压/电流/电阻单片机 MCU电感阴阳极/正负极,YOUR SITE HER

7、E,Sentence explanation（句型讲解）,YOUR SITE HERE,The essential usefulness of a transistor comes from its ability to use a small signal applied between one pair of its terminals to control a much larger signal at another pair of terminals.晶体管的重要用途来源于其能力，使用一对端子 之间的弱信号控制另外一对端子之间的强信号。,Sentence explanation（句型

8、讲解）,YOUR SITE HERE,Diodes are basically a one-way valve for electrical current.They let it flow in one direction（from positive to negative）and not in the other direction.二极管基本上是电流的单向阀。只能允许电流在 一个方向流动（从正极到负极），而另一个方向 无法流动。,The capacitance of a circuit element is defined as the ratio of current flowing

9、through it to the time derivative of the voltage across it.,YOUR SITE HERE,Sentence explanation（句型讲解）,电路元素中的电感值定义为流经电路与流经电 压对时间微分的比值。,Sentence explanation（句型讲解）,YOUR SITE HERE,Unlike general-purpose computers,the PLC is designed for multiple inputs and output arrangements,extended temperature ranges

10、,immunity to electrical noise,and resistance to vibration and impact.与通用计算机不同，PLC设计用于多输入和多输出，适用温度范围大，对电气噪声有免疫力，可抵抗振 动和冲击。,Sentence explanation（句型讲解）,YOUR SITE HERE,The figure shows the basic type of electrical circuit,in the form of a block diagram.It consists of a source of electrical energy,some s

11、ort of load to make use of that energy,and electrical conductors connecting the source and the load.该图形用方框图展示基本类型的电路。包括电源，利用能量的负载以及连接电源和负载的导体。,Electrical System,Mostdiodesaresimilarinappearancetoa resistor.Basicelectroniccomponentscanbeonly packageddiscretely.Abatteryfunctionslikeacapacitor,butcharg

12、esanddischargesmuchmoreefficiently.DickMorleyisconsideredtobefatherof.ThelastownerofModiconis company.（American/German/French/China）TheSIunitformeasuringcurrentis.YTOUhR SeITE HEPRE LCwasinventedinresponsetotheneeds,Exercise Analysis（习题分析）,参考第142页第三段。B参考第144页图9-6。A参考第145页第三段。B参考第146页倒数第二段。B参考第147页第一段。CYOUR SITE HERE,Exercise Analysis（习题分析）,参考第141页第一段。C参考第144页倒数第二段。本题需要注意的 主语，也就是看充放电效率高是哪种元件。B参考第142页第二段。A参考第146页第二段。D参考第144页最后一段。YOURBSITE HERE,Thank You!,