人教版选修《电源和电流》教案
人教版选修3-1
第二章恒定电流
§2.1电源和电流
一、教学目标
1.知识与技能
（1）了解形成电流的条件，知道电源的作用和导体中的恒定电场。
（2）理解电流的定义，知道电流的单位、方向的规定；理解恒定电流。
（3）从微观角度理解导体中电荷定向移动与电流之间的关系。
2.过程与方法
（1）运用类比方法，利用抽水机类比电源，帮助学生理解电源的作用。
（2）初步体会动态平衡的思想。
（3）学习利用数学推导的探究方法，经历金属内自由电子定向移动速率的推导过程，帮助学生从微观角度理解电流。
3．情感态度与价值观
根据学生刚学过的电场知识入手，分析、讨论问题，有效地将“场”和“路”的知识相联系，有利于培养学生不断运用学到的知识分析、解决实际问题的意识和能力。
二、重点与难点
1.重点
（1）理解电源的作用；电流的形成过程。
（2）恒定电场的概念；恒定电流的概念。
（3）电流的定义、方向；电流的微观表达式。
2.难点
（1）利用动态平衡来理解恒定电场的概念
（2）电流的微观表达式
三、教学方法和教学辅助工具
1.教学方法
本节内容重在理论分析和推导，内容较抽象；并且是电场知识在电路中的运用，所以本节的教学方法采用理论分析、类比、数学建模、推导等方法。本节内容不适合采用实验探究方法，故教学过程中没有演示实验和学生分组实验。
2.辅助工具
多媒体课件，导学学案
四、教学流程图
五、教学过程
1．引入：
观察图片：闪电和手电筒发光。
问题：产生持续电流的条件是什么？
学生：因为有电源！
问题1：电源怎么产生持续电流？
2.分析金属导体中电流的产生过程
导体中电子的热运动不能产生电流。
形成电流的条件是：导体两端有电势差（电压）
3.电源的作用
短暂的电势差（电压）只会产生瞬时电流。
用抽水机类比电源：电源在其内部源源不断地把自由电子从正极搬到负极；保持导体两端的电势差，使电路中保持持续的电流。
问题2：导线有电流时的电场是什么样的？
4.恒定电场
导线内的电场，是由电源、导线等电路元件所积累的电荷共同形成的。尽管这些电荷也在运动，但有的流走了，另外的又来补充（形成导线内电荷量的动态平衡），所以电荷的分布是稳定的，电场的分布也稳定。这就称为恒定电场。
问题3：恒定电场形成什么样的电流？
5.恒定电流
（1）大小方向都不随时间变化的电流称为恒定电流.
（2）电流(I)：表示电流的强弱程度.
定义：通过导体横截面的电量q跟通过这些电量所用时间t的比值叫做电流.
公式：I= q / t （定义式，比值法定义）
国际单位：安培(A) 1A=1C/s
常用单位：毫安（mA）、微安（μA）
方向:正电荷定向移动的方向
电流是标量．它的运算不遵循平行四边形定则
注意：
○1适用于任何电荷的定向移动形成的电流。
○2在金属导体中，电流方向与自由电荷（电子）的定向移动方向相反；
○3在电解液中，电流方向与正离子定向移动方向相同，与负离子走向移动方向相反．导电时，是正负离子向相反方向定向移动形成电流，电量q表示通过截面的正、负离子电量绝对值之和。
用两个例题巩固电流的定义式。
问题4：电流大小由什么因素决定？
（3）黑板上推导公式：I=nesv
6.黑板上讲解课本例题
问题5：自由电子的定向移动速率与生活经验相符合么？
7.解释：闭合电路开个后，电路中各个位置迅速建立起恒定电场，在恒定电场的作用下，电路中各处的自由电子几乎同时开始定向移动，整个电路也就几乎同时形成了电流。
8.小结
（1）我学到了什么知识？
电源的作用；电流的定义式和决定式。
（2）我掌握了什么方法？
类比法；数学推导的探究方法。
（3）我收获了什么？
运用学到的知识分析、解决实际问题的意识和能力。
六、板书
§2.1电源和电流
1、形成电流的条件：
2、电源的作用
3、恒定电场
4、恒定电流
（1）定义
（2）电流定义式 I=q/t
（3）电流决定式 I=nesv 推导：q=(vtS)ne
I=q/t=neSv
例题
则这段导线中的原子数为
则这段导线中的自由电子数也为n t 时间内通过导体横截面的电荷量是 e N M vts ne q A ρ==A
N M vts
n ρ=把这个式子代入I ＝q/t,得 解得
M
e
vsN I A ρ=
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新人教版英语高三选修9：Unit 2教案【第4课时】 The Fourth Period Practicing Learning about Language Teaching Aims: 1.Revise the language points learned in the last period. 2.Do the exercises in this part. Teaching Important Points: 1.Discover useful words and expressions. 2.Revise useful structures. Teaching Methods: 1.Discussion method. 2.Pair work or group work. Teaching Aids: 1. a computer; 2. courseware Teaching procedures Step1 Greetings Greet the whole class as usual. Step2 Revision Translate the following sentences into English: 1.我对杰夫真是搞不明白，他忽而对我友好，忽而对我视若路人。 I can’t work out Geoff out; one day he’s friendly, the next day he ignores me completely. 2. 他认为美与善是一致的。 He identifies beauty with goodness． 3. 到周末你很可能会发现你需要更多东西。 You might well find that you’ll need more by the we ekend. 4. 他们在海上迷失的方向,任凭风和天气的摆布。 They were lost at sea, at the mercy of wind and weather. 5. 即便他能通过考试，以后找工作也成问题。 He will have problems in finding a job even if he can pass the exam. 6. 他把车沿着围墙停放。 He parked his car alongside the fence. Step 3 Discussion I. Pair work. Ask the students to do the exercises about Discovering useful words and expressions. 1 Replace the words underlined by ones of similar meaning from the reading passage. 1 Seeing the dark clouds above him, George hurried for home. 2 Sailing a boat alone far way from the shore made Flora’s parents worry about her safety. 3 Clare, would you please put your bicycle next to the others in the shed? 4 “Why don’t you plot a more simple route with the smallest number of stops?” asked Mary. 5 Setting out on a long journey by sea with unskilled sailors would be dangerous especially if there were no modern navigational instruments. 2 Find the words from the reading passage that are the opposite of these compound words. anywhere upload inward unreliableland flower strong point 3 Write down the words you know, which are related to navigation and sea.
人教版选修6 Unit1教案
Unit 1 Living well Teaching aims（教学目标）三维目标 知识目标Knowledge aims: 1.Key words and phrases in this unit: abstract(抽象的)，sculpture(雕塑)，gallery(画廊)，faith(信念)，aim(目标)，conventional(传统的)，typical(典型的，有代表性的)，evident(明显的)，adopt(采用)，possess(拥有)，superb(卓越的，杰出的)，possession(财产)，technique(技术)，by coincidence(巧合地)，a great deal(大量)，shadow(阴影)，ridiculous(可笑的)，controversial(争议的)，attempt(尝试；企图)，on the other hand(另一方面)，predict(预测)． 2．To learn about some major movements in Western art and how art has changed stylistically over the centuries. 3．To learn how the information is organized. 4．To develop the students' reading ability by skimming and scanning the passage. 5．To develop the students' speaking ability by talking about Western paintings. 6．To get the students to understand and use the following important and useful sentence patterns：If you could have three of these paintings on the walls of your classrooms，which would you choose? If you were an artist，what kind of pictures would you paint? Grammar in this unit: 虚拟语气(Subjunctive Mood) 能力目标Ability aims: 1.To learn about some major movements in Western art and how art has changed stylistically over the centuries. 3.To improve their reading sk 4. Develop students’ reading ability and let them learn different reading skills. 情感目标 1．To stimulate students' sense of beauty and the ability of understanding，enjoying and creating beauty. 2．To develop students' sense of cooperative learning. 3. Activate the students’interest of learning English by using many kinds of classroom activities. Important points（教学重点）
人教版高三英语选修9Unit5Insideadvertising全单元教案
Unit 5 Inside advertising Lecture 1 words and expressions Teaching aims: make the Ss to master the following words and expressions. Teaching important points: words Teaching difficult points : the differences between words Rise and raise worth , worthy and worthwhile Teaching methods: pair and group work Teaching steps: I，words 1.advertise v. advertise sth. advertise for sth/sb n. advertisement answer an advertisement place/ put/ run/ publish/ insert an advertisement for sth https://www.360docs.net/doc/2110238834.html,rm inform sb of sth make sb informed of sth 3.expense at one’s expenses 4.rely on =lean on =depend on 5.response in response to respond to 6.fashion come into fashion in fashion go out of fashion adj. fashionable II. difference between words 1.worth a.sth be worth +money b.sth be well worth doing worthy a.sth be worthy of + n b.sth be worthy {of being done to be done worthwhile a.It is worthwhile to do sth /doing sth b.It is worth one’s while. 2. rise raise rise vi. 不用被动语态。上升。上涨起身起床 a rising sun a risen sun raise vt. 把…举起增加种植唤起提出抚养筹钱 collect / raise money for raise one’s voice III. Homework Ask the Ss to bear the words above in mind After that , do a piece of paper to train the Ss’ ability of using the language. Notes: Lecture II Reading Teaching Aims:
最新高中英语全册教学大纲 (全)
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创业培训课程一、四大培训特色： 3
1、全实战专家授课：授课老师全部都是具有资深企业管理、运营经验的企业家、企业高管、投资人等，通过传授自身的企业运营经验，给创业培训班学员带来务实的指导和帮助！课堂之外，我们根据创业业者不同层次、不同阶段的不同需求，邀请资深专家给学员提供个性化服务，伴随创业者一路成长。 2、案例教学。我们以案例教学、头脑风暴、企业参访、角色互动等方式，让学员分组讨论学习商业计划书的写作，以帮助学员更系统地分析创业计划，在实践中更容易获得投资人的赏识。学员通过系统的学习创业知识，不仅能够提升创业能力，降低创业风险，还能结交到良师益友。 3、模拟商战。引入全球模拟公司联合体中国中心的“金马兰创业实训平台”，组织学员模拟现实市场环境，进行实战演练。通过创业实训平台的学习，学员对企业经营管理有更深入的理解。 4、增值服务。我们以创业培训为基础，整合各类创业资源，为学员提供融资、法律、财务、营销、媒体、孵化器等各类资源，充分满足学员的个性化需求，以最大程度地帮助学员创业成功。学员结业后均可加入第一创业俱乐部，参加我们举办的各类主题的创业讲座、沙龙、论坛、项目路演、聚会等，我们将为学员提供持续、有效、完善的增值服务。二、培训目标： ·掌握创业的基本要素、实施步骤、开业流程及经营技能，提升创业能力，降低创业风险； . 掌握商业模式、品牌管理、项目评估、市场营销、财务管理、商务沟通、股权架构、团队领导力等系统的创业知识； ·了解现阶段的创业环境及政府的相关创业补贴和扶持政策； ·规划创业生涯，掌握撰写切实可行的创业计划书的方法； 三、内容： 品牌命名与商标注册 市场开发与营销推广 股权分配与公司治理 公司财务规划与管理 团队领导力培养与提升 商业计划书写作 投资收益风险评估 环境分析 项目确定公司注册 创业计划开业准备 公司经营与管理 公司交易 创业能力测评 风险管理 项目路演 商务沟通 4
高二英语选修7-unit5教案
Unit 5 Travelling abroad Ｉ.单元教学目标
III. 教材分析与教材重组 1. 教材分析 本单元以travelling abroad为话题，旨在通过单元教学，使学生了解在国外旅行或学习时可能会遇到的一些问题，并学会怎样去解决问题和避免这样问题的发生。学会表达和支持个人观点，能用所学的有关travelling abroad的词汇描述在国外居住生活的情况，在国外旅游时能根据所给的信息选择恰当的旅游线路，能推测什么事情可能会发生，哪种情况不会发生，会正确使用非限制性定于从句。 1．1WARMING UP 提供了四个有关旅行的问题，让学生用已有的知识和经验讨论在国外居住或旅行会遇到什么问题，并且该如何来解决这 些问题。 1．2 PRE-READING是READING的热身活动。提供了两个问题，它要求采用与同学讨论交流的方式谈论在国外学习的利与弊，激发同学们的学习兴趣。 1．3 READING是一篇介绍中国女孩谢蕾在伦敦学习的情况。使学生对比在国内学习与在国外学习的不同。Try to understand some of the benefits and difficulties she has in London. 1．4 COMPREHENDING 练习1通过四个问题来检查学生对课文的细节的理解。 练习2以图表的形式来分析在国外学习的利与弊。 练习3设置了五个讨论题，通过这些话题的谈论，挖掘文章的深层含义，激活学生自身的认知能力和思想认识能力。 练习4是概括能力训练题，在理解的基础上，重点训练学生的概括能力。 1．5 LEARNING ABOUT LANGUAGE分词汇和语法两部分。其中，Discovering useful words and expressions是训练学生在语境中掌握词汇的能力，帮助学生加强动词变化形式的意识。Revising useful structures 是关于非限制性定于从句，旨在训练学生对定语从句的理解、掌握和运用，并通过语法练习加以巩固。 1．8 USING LANGUAGE中的第一部分Listening要求学生先根据秘鲁的地图谈论有关秘鲁这个国家的一些情况, 然后完成三个相应的任务型练习。首先是要求学生在听第一遍时能完成听力练习1的任务，即：选择那些是Lia喜欢做
人教版高中英语选修9单词汇总教学内容
选修九 Unit 1 hurding 跨栏运动 boxing n.拳击 hula hoping 玩呼啦圈 △pogo stick jumping弹簧单高跷游戏 △jumping jack 跳爆竹 somersaulting n. 翻筋斗 lunge n. vt. 刺，越近，前冲 △Ashrita Furman 阿什里塔.弗曼 Guinness 吉尼斯 Guiness book of Word Records《吉尼斯世界纪录大全》approximate adj. 近似的，大概的 approximately adv. 近似地，大约地 conventional adj. 习俗的，传统的 laughter n. 笑，笑声 reality n. 真实，事实 in reality 实际上，现实 ajustment n.调节，调整 tough adj. 强硬的，困难的adv. 顽强的 exreme adj. 极端的，偏激的 vomit n. 呕吐，呕吐物 gymastics n. 体操，体能训练 gymnastically adv. 体能训练方面 unfit adj. 不适宜的,不太健康的 fascinate vt. 使着迷，入迷 meditation n. 沉思，冥想 △Sri chinmoy 斯里琴摩 spritual adj. 精神上的 marathon n. 马拉松赛跑 urge vt. 催促，力劝 accomplish vt. 完成，实现 motivation n. 动机 devotion n. 热爱，投入 soul n.灵魂，心灵，精神 sacred adj. 宗教的，庄严的 deed n. 行为，功绩 conception n. 主意，计划 tact n. 机敏，乖巧，老练，技巧 regret vt. vi. 后悔，感到，抱歉 repentance n. 后悔 wisdom n. 智慧 virtue n. 美德 noble adj. 高尚的，贵族的