山西省忻州市第一中学高中物理5.3电感和电容对交变电流的影响预习案(无答案)新人教版选修3_2.doc

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1、1电感和电容对交变电流的影响【教学目标】1通过实验,体会并了解电感器和电容器对交变电流的阻碍和导通作用。2通过对电感和电容在电路中作用的简单分析,了解感抗和容抗这两个物理量。3通过分析,了解扼流圈的种类和作用;了解隔直电容器和高频旁路电容器的作用。4通过分析比较电阻电路、电感电路和电容电路,深刻理解它们对交、直流的影响。5本节知识与生活、生产有着广泛的联系,有重要的实用价值。【预习任务】1阅读教材“电感对交变电流的阻碍作用”内容,思考下列问题:(1)知道:电感器对交流电有阻碍作用,其阻碍作用大小用感抗表示。(2)知道:感抗与哪些因素有关,并能定性说明它们之间的关系。2教材图 5.3-4 中的演

2、示实验将发生什么现象,说明了什么?3思考:对图 5.3-4 中接交流电的电容器,若将其两端用导线短接,发现灯泡变亮,又说明了什么?4阅读教材“电流能通过电容器”内容,思考下列问题:(1)知道:电容器对交流电有什么影响?(2)思考:交流电“通过”了电容器,引号的含义?(3)识记:容抗与哪些因素有关,并能定性说明它们之间的关系。2【自主检测】1电感器对交流电的阻碍作用的大小用 表示,线圈对交流电阻碍作用的大小与 和 有关。扼流圈分为两类,一类是 这种扼流圈可以用来 ,另一类是 ,可以用来 。2当电容器接到交流电源两端时,电容器交替地进行 和 ,电路中就有了电流,表现为交流 了电容器。电容器对交流电阻碍作用的大小用 表示,电容器对电流的阻碍作用大小与 和 因素有关。【组内检查】1低频扼流圈、高频扼流圈、隔直电容器、高频旁路电容器3

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