《2022年人教版高中物理选修《互感自感》word导学案 .pdf》由会员分享,可在线阅读,更多相关《2022年人教版高中物理选修《互感自感》word导学案 .pdf(4页珍藏版)》请在淘文阁 - 分享文档赚钱的网站上搜索。
1、名师精编优秀教案学习内容学习目标:1.通过实验,了解互感和自感现象,以及对它们的利用和防止。2能够通过电磁感应的有关规律分析通电、断电时自感现象的成因,以及磁场的能量转化问题。3.能记住自感电动势的计算式子tILE,能说出自感系数的物理意义。4.认识互感和自感是电磁感应的特例。5.能说出涡流是怎么产生的,以及涡流现象的利用和危害。6.能说出电磁阻尼和电磁驱动现象。学习重点:1自感现象2自感系数学习难点;分析自感现象【回顾预习】阅读第六节完成下列填空:1自感现象是指而产生的电磁感应现象2自感电动势的方向:自感电动势总是阻碍流过导体电流的变化,当电流增大时,自感电动势的方向与原来电流的方向;当电流
2、减小时,自感电动势的方向与原来电流的方向。3自感电动势的大小与通过导体的电流的成正比3当导体在磁场中运动时,感应电流会使导体受到,安培力总是导体的运动,这种现象称为【自主合作探究】1、互感现象思考:在法拉第的实验中两个线圈并没有用导线连接,当一个线圈中的电流变化时,在另一个线圈中为什么会产生感应电动势呢?请同学们用学过的知识加以分析说明。互感:互感电动势:利用互感现象,可以把能量从一个线圈传递到另一个线圈。因此,互感现象在电工技术和电子技术中有广泛的应用。2、自感现象思考:当电路自身的电流发生变化时,会不会产生感应电动势呢?你能否设计一个实验来观察一下自感现象?名师精编优秀教案实验 1通电自感
3、现象。电路图(如图所示),A1、A2是规格完全一样的灯泡。闭合电键S,调节变阻器R,使A1、A2亮度相同,再调节R1,使两灯正常发光,然后断开开关S。重新闭合 S,观察到什么现象?(实验反复几次)思考:为什么A1比 A2亮得晚一些?实验 2断电自感。电路图(如图所示)接通电路,待灯泡A 正常发光。然后断开电路,观察到什么现象?思考:为什么A 灯不立刻熄灭?总结上述两个实验得出结论自感现象:自感电动势:3自感系数自感电动势的大小决定于哪些因素呢?请同学们阅读教材内容。然后用自己的语言加以概括,并回答有关问题。4磁场的能量在断电自感的实验中,为什么开关断开后,灯泡的发光会持续一段时间?甚至会比原来
4、更亮?试从能量的角度加以讨论。教材最后一段说,线圈能够体现电的“惯性”,应该怎样理解?电的“惯性”大小与什么有关?典型例题 自感现象的分析与判断例1、如右图所示电路中,D1和D2是两个相同的小灯泡,L是一个自感系数很大的线圈,其电阻与 R相同,由于存在自感现象,在开关 S接通和断开瞬间,D1和D2发亮的顺序是怎样的?文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 H
5、Q9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 Z
6、L8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编
7、码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8
8、 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6
9、 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文
10、档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1
11、V8 HQ9G3C9P10F6 ZL8E5F3B8X3名师精编优秀教案例2 如右图所示的电路(a)、(b)中,电阻 R和自感线圈L的电阻值都很小接通S,使电路达到稳定,灯泡A发光A在电路(a)中,断开 S,A将渐渐变暗B在电路(a)中,断开 S,A将先变得更亮,然后渐渐变暗C在电路(b)中,断开 S,A将渐渐变暗D在电路(b)中,断开 S,A将先变得更亮,然后渐渐变暗 当堂达标 1 右图所示为一演示实验电路图,图中L是一带铁芯的线圈,A是一个灯泡,电键 S处于闭合状态,电路是接通的 现将电键 S打开,则在电路切断的瞬间,通过灯泡A的电流方向是从_端到 _端这个实验是用来演示_现象的左右自感2右
12、图所示是演示自感现象的实验电路图,L是电感线圈,A1、A2是规格相同的灯泡,R的阻值与 L的电阻值相同当开关由断开到合上时,观察到自感现象是 _,最后达到同样亮同样3如右图所示,两灯A1、A2完全相同,电感线圈与负载电阻及电灯电阻均为R当电键 S闭合的瞬间,较亮的灯是_;电键 S断开的瞬间,看到的现象是_4如右图所示,A1、A2是完全相同的灯泡,线圈L的电阻可以忽略,下列说法中正确的是:DA开关 S接通时,A2灯先亮、A1灯逐渐亮,最后A1A2一样亮B开关 S接通时,A1、A2两灯始终一样亮C断开 S的瞬间,流过 A2的电流方向与断开S前电流方向相反D断开 S的瞬间,流过 A1的电流方向与断开
13、S前电流方向相反文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:
14、CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 H
15、Q9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 Z
16、L8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编
17、码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8
18、 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6
19、 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3名师精编优秀教案【反思提升】【拓展延伸】1下列关于自感现象的说法中,正确的是(AD)A自感现象是由于导体本身的电流发生变化而产生的电磁感应现象B线圈中自感电动势的方向总与引起自感的原电流的方向相反C线圈中自感电动势的大小与穿过线圈的磁通量变化的快慢
20、有关D加铁芯后线圈的自感系数比没有铁芯时要大2 关 于 线 圈 的 自 感 系 数,下 面 说 法 正 确 的 是(D)A线圈的自感系数越大,自感电动势一定越大B线圈中电流等于零时,自感系数也等于零C线圈中电流变化越快,自感系数越大:【布置作业】完成下一节预习案文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:
21、CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 H
22、Q9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 Z
23、L8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编
24、码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8
25、 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3文档编码:CV4C6Q5X1V8 HQ9G3C9P10F6 ZL8E5F3B8X3
限制150内