电场线教学ppt课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,电 场 线,电 场 线,电荷的周围存在电场，怎样来形象的描述它呢？,电荷的周围存在电场，怎样来形象的描述它呢？,电场线教学ppt课件,在电场中画一些曲线，使曲线上每一点的切线方向与该点的场强方向一致。,1,电场线,在电场中画一些曲线，使曲线上每一点的切线方向与该点的,电场线教学ppt课件,在电场中画一些曲线，使曲线上每一点的切线方向与该点的场强方向一致。,1,电场线,2,点电荷的电场线,在电场中画一些曲线，使曲线上每一点的切线方向与该点的,电场线教学ppt课件,在电场中画一些曲线，使曲线上每一点的切线方向与该点的场强方向一致。,1,电场线,2,点电荷的电场线,在电场中画一些曲线，使曲线上每一点的切线方向与该点的,电场线教学ppt课件,在电场中画一些曲线，使曲线上每一点的切线方向与该点的场强方向一致。,1,电场线,2,点电荷的电场线,3,其它几种常见电场的电场线,在电场中画一些曲线，使曲线上每一点的切线方向与该点的,几种常见电场的电场线分布,(1).,带等量异种点电荷的电场线,:,几种常见电场的电场线分布(1).带等量异种点电荷的电场线:,电场线教学ppt课件,(2).,带等量同种点电荷的电场线,:,几种常见电场的电场线分布,(1).,带等量异种点电荷的电场线,:,(2).带等量同种点电荷的电场线:几种常见电场的电场线分布(,电场线教学ppt课件,(3).,点电荷与带电平板的电场线,(3).点电荷与带电平板的电场线,电场线教学ppt课件,(3).,点电荷与带电平板的电场线,(3).点电荷与带电平板的电场线,几种常见电场的电场线分布,几种常见电场的电场线分布,（,1,）,静电场的电场线总是,从正电荷（或者从无穷远）出发到负电荷终止（或者延伸到无穷远）；,（,2,）电场线的,疏密,表示电场强度的,大小,。,4,电场线的性质,电场线越,密,的地方，场强越,大,;,电场线越,稀,的地方，场强越,小,；,（1） 静电场的电场线总是从正电荷（或者从无穷远）出发到负电,几种常见电场的电场线分布,几种常见电场的电场线分布,（,1,）,静电场的电场线总是,从正电荷（或者从无穷远）出发到负电荷终止（或者延伸到无穷远）；,（,3,）,任意两条电场线都,不相交,；,4,电场线的特征,（,2,）电场线的,疏密,表示电场强度的,大小,。,电场线越,密,的地方，场强越,大,;,电场线越,稀,的地方，场强越,小,；,（1） 静电场的电场线总是从正电荷（或者从无穷远）出发到负电,注意：电场中的某一点电场方向是唯一的。,o,注意：电场中的某一点电场方向是唯一的。o,（,1,）,静电场的电场线总是,从正电荷（或者从无穷远）出发到负电荷终止（或者延伸到无穷远）；,（,3,）,任意两条电场线都,不相交,；,4,电场线的特征,（,4,）电场线客观是,不存在,的，是人为画的,假想,线。,（,2,）电场线的,疏密,表示电场强度的,大小,。,电场线越,密,的地方，场强越,大,;,电场线越,稀,的地方，场强越,小,；,（1） 静电场的电场线总是从正电荷（或者从无穷远）出发到负电,各点场强大小和方向都相同,的电场叫匀强电场。,5,匀强电场,匀强电场的电场线是怎样分布的？,？,电场线的特点,：,间隔相等的平行直线。,E,各点场强大小和方向都相同的电场叫匀强电场。5匀强电,通常情况下怎样得到匀强电场？,带,等量异种,电荷、,大小相等,、互相,靠近且正对,的两,平行,金属板中部区域的电场就是匀强电场。,？,通常情况下怎样得到匀强电场？ 带等量异种电荷、大小相等,电场线教学ppt课件,如图所示，为一条水平向右的电场线，由此能确定,a,、,b,、,c,三点的场强方向吗？能否判断三点的场强的大小？为什么？,a,b,c,(1),E,a,=E,b,=E,c,如图所示，为一条水平向右的电场线，由此能确定a、b、c三,a,b,c,a,b,c,(3),(4),E,a,E,b,E,c,E,a,E,c,E,b,E,c,abcabc(3)(4)EaEbEcEaE,课堂小结（附板书设计）：,电场线,1.,电场线,在电场中画一些曲线，使曲线上的每一点的切线方向与该点的场强方向一致；,2,点电荷的电场线,3,其它几种常见电场的电场线,4,电场线的性质,（,1,）静电场的电场线总是从正电荷（或者从无穷远）出发到负电荷终止（或者延伸到无穷远）。,（,2,）电场线越密的地方,场强越大,;,电场线越稀的地方，场强越小。,（,3,）电场中任何两条电场线都不会相交。,（,4,）电场线是假想线，不是真实存在的。,5,匀强电场,场强大小和方向处处相同的电场叫匀强电场。,匀强电场的电场线特点：距离相等的平行直线。,课堂小结（附板书设计）：,谢谢指导！,谢谢指导！,Chapter1 Body language,Chapter1 Body language,speaking,ringing,writing,typing,Spoken language,Written,language,Body language,Ways of communicating,gesturing,speakingringingwritingtypingSp,Body language: gestures & expression,Body language: gestures & exp,gesture,手势，姿势,n.,body language:gesture & expression,thumbs up,good job /,the number one,gesture 手势，姿势n.body language,gesture,手势，姿势,n.,OK,bad,gesture 手势，姿势n.OKbad,gesture,手势，姿势,n.,Come here.,Be quiet!,gesture 手势，姿势n.Come here.Be,expression,表情，神态,shocked,thoughtful,expression 表情，神态shockedthough,expression,表情，神态,excited,tired,expression 表情，神态 excited tire,surprised,Body language shows different feelings.,angry,sad,Its unfair!,Wheres my,Mum?,I won a tour around world?,surprisedBody language shows d,disappointed adj.,be disappointed at sth.,Jay was disappointed at the,bad news.,disappointed,Why cant I find a good job?,disappointed adj.disappointe,Look at the photo and skim the story to find out:,1. What is the main topic of the story?,2. Where are Debbie and Simon?,Body language.,They are at work, in the office of a travel agency.,Look at the photo and skim the,3. Who gives Simon advice?,4. In the photo, which person looks more friendly, the boy or the girl?,A senior employee, Mr Young.,The girl (Debbie).,3. Who gives Simon advice?A se,Read the story and complete the chart:,name,Body language,outcome,Debbie,Simon,sit up and hold head up, make eye contact with the customers, always smile, greet cheerfully,look friendly, make others feel welcome,rest head on hand, look downwards, never smile,look unfriendly, make others go away,Read the story and complete,well-dressed,穿着讲究的,adj.,People are,well-dressed,at the wedding.,well-dressed 穿着讲究的adj.People,enter,进入,登台,v.,Dont enter the office without knocking.,exit,退出,退场,v.,出口,n.,entrance,入口,n.,exit visa,出境签证,fire exit,安全出口,enter 进入,登台 v.Dont enter th,glance at,匆匆一看,浏览报纸,glance at the newspapers,greet,和某人打招呼，迎接,v.,greeting,问候，欢迎,n.,People in France greet friends with kissing instead of shaking hands.,glance at 匆匆一看浏览报纸 greet 和某人打,sigh,叹气,v. / n.,How can I lose my weight?,he,sigh,ed.,Miss Cat left with a,sigh,.,Poor guy!,sigh 叹气 v. / n.How can I los,Whats up, Simon?,Whats up?,= Whats the matter?,a senior employee,一位级别较高的职员,senior: holding a higher position,employee: a person who is paid to work for other people,Whats up, Simon?Whats up? a,prefer A (to B),选择,(,而不选择,),你想喝什么，茶还是咖啡？,Which would you prefer, tea or coffee?,我想喝茶，不想喝咖啡,I,prefer,tea,to,coffee.,她愿意步行，不愿意骑车,She,prefer,s walking,to,cycling.,The customers always,prefer,Debbie,to,me.,prefer A (to B)选择(而不选择)The,Its the way you,communicate,.,communicate with sb,.,与某人沟通,Parents should always communicate with their children,.,communication,沟通，交流,n.,Speech is not the only method of communication.,语言并不是唯一的沟通方式,Its the way you communicate.,I dont even,get a chance,to speak to them.,我甚至没有和他们说话的机会,get a chance,有机会,take a chance,冒一冒险,碰碰运气,by chance,偶然,意外地,I met an old friend by chance.,I dont even get a chance to s,Speech,is not the only way,we communicate,.,语言,并不是我们唯一的,沟通,方式,.,Its the way,you stand and sit.,定语从句,它是,你站立和坐姿,的方式。,Speech is not the only way we,那是一种怎样的语言,?,What kind/sort of?,什么类型,？,What kind/sort of,shoes would you like?,What kind of language is that?,那是一种怎样的语言?What kind of languag,You whole,appearance,communicates things.,你的整体外貌都能传达信息,appearance,外观，外貌出现,n.,Dont judge by appearances,.,切勿以貌取人,appear,出现,v.,He didnt appear until 9pm.,直到点他才出现,You whole appearance communica,He,rest,s his head on his hand.,rest,被支撑，托,v.,He doesnt look up.,He never smiles.,Simon,He does not make a good impression on people.,make a good imopression on sb.,给某人留下好印象,He rests his head on his hand.,make eye contact with,与某人眼神交流,She is holding her head up.,She smiles.,She,makes eye contact with,the customers.,Debbie,make eye contact with 与某人眼神交,It is important to,make eye contact with,your teamplayers when playing basketball.,make eye contact with,与某人眼神交流,It is important to make eye c,Without hesitation, she went to Simon and gave him a big smile.,hesitation,犹豫,n.,She agreed without hesitation.,她毫不犹豫地同意了,hesitate,犹豫,v.,Dont hesitate to tell us if you have a problem.,你有问题就直截了当地告诉我们。,Without hesitation, she went t,She wanted to,remind,me that tomorrow is her birthday.,remind,提醒,v.,Do I have to remind you again?,需要我再次提醒你吗？,remind sb of sth.,提醒某人某事,This song,remind,s me,of,my hometown.,这首让我想起了我的家乡,reminder,提示信，通知信,n.,She wanted to remind me that t,C Find the meaning,1. d,2. f,3. a,4. c,5. e,6. b,C1,C2,1. sighed,2. appearance,3. without hesitation,4. part-time,5. gestures,6. speech,C Find the meaning1. dC1C21. s,D Read and think,a Mr Young said that body language is important.,b The lady walked over to Debbie instead of Simon.,c Simon began to sit up and smile.,d A well-dressed lady entyered the travel agency.,e Simons sister came to remind hm of her birthday.,f SImon sighed.,g Mr Young said that Simon looked dwon and never,smiled.,4,2,6,1,7,3,5,D Read and thinka Mr Young sa,D2 Read the story again and answer the,following questions.,1 Why was Simon unhappy?,2 What are the two ways of communication in,the story?,The customers always prefer Debbie to him.,Speech and body language.,D2 Read the story again and an,3 What is body language, according to,Mr Young?,4 Why did the customers not go to Simon?,Its the way someone stands and sits. Its,gestures and the expression on someones,face and in his or her eyes.,He didnt make a good impression on the,customers.,3 What is body language, accor,5. Did Mr Young think Debbie had good body,language? Why?,6. Did Simon take Mr Youngs advice? What,did he decide to do?,No. Because he often rest his head on his,hand. He doesnt look up. He never smiles.,Yes, he did. He decided to improve his,body language.,5. Did Mr Young think Debbie h,1. Sarah,glanced at,the news and said nothing.,Sarah quickly read the news and said nothing.,2. The picture reminded me of my childhood.,The picture helped me remember my childhood.,Paraphrase these sentences,1. Sarah glanced at the news a,3. She agreed to go with us without hesitation.,She agreed to go with us at once.,4. An air-hostess should make eye contact with passengers when they ask for help.,An air-hostess should look directly at passengers when they ask for help.,3. She agreed to go with us wi,5. He prefers math to English.,He likes math better than English.,6. We have made up our minds to improve our English.,We have decided to make our English better.,5. He prefers math to English.,7. Please give my regards to your parents.,Please remember me to your parents.,8. Whats up, Simon?,Whats the matter, Simon?,Whats happening, Simon?,7. Please give my regards to y,