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初中物理教资面试试讲真题逐字稿《用电压表测电压》

  • 2026-05-13 15:36:40
初中物理教资面试试讲真题逐字稿《用电压表测电压》

《用电压表测电压》试讲逐字稿

面试真题解析

《用电压表测电压》试讲逐字稿

各位考官：大家好，我是初中物理组的 01 号考生，我试讲的题目是《用电压表测
电压》，下面开始我的试讲。
上课，同学们好!上课之前老师想请同学们回忆一下电路中电压的大小应该利用什么仪器进行测量?举手最快这名同学你请来说。他说测量电压要用电压表。请坐，看来你对于之前的知识掌握得很牢固。同学们，在只有一个用电器的电路中，用电器两端电压和电源两端电压之间存在怎样的关系呢?能否利用电压表测量并得出结论?带着这个疑问，我们一起来走进今天的新课《用电压表测电压》。
同学们我们先来从连接电路的角度思考，需要哪些实验仪器?老师听到有的同学说要
用到电源、开关、导线，还有的同学说需要小灯泡、电压表等仪器。
我们已经知道了要用到的实验仪器，那么再来想一想，怎样正确使用电压表?第二排
这名男同学你请来说。很好，请坐，他说使用前，要预估待测电压，选择电压表中恰当的量程，使用中电压表要注意正接线柱电流流入，负接线柱电流流出，且电压表要与被测用电器并联。还有哪位同学能来补充?同桌请来补充。她说如有需要，可以直接与电源进行串联，此时测量的是电源电压。待示数稳定后读数，认清所选量程所对应的分度值，进行正确读数。使用后要将仪器整理放回。请坐，看来同学们对于上节课的知识已经完全掌握了。
要用电压表进行测量电压，具体步骤是什么呢?老师在多媒体屏幕上展示了一张实验仪器图，同学们试着结合图片说一说测量的具体步骤应该是什么?靠窗的这名女同学你
请说。她说先将电压表接在小灯泡的两端，接通电路，读取电压表的示数;再将电压表接在电源两端，接通电路，读取电压表的示数。观察两次测量电压表的示数。很好，请坐，总结得十分全面。
那么同学们，测量过程中需要注意什么问题呢?老师在这里告诉大家实验的注意事
项。首先一定要先连接电路，检查无误后再闭合开关进行测量。每次想要更改电路，需要先将开关断开，再进行操作。
现在同学们相邻四人为一小组，老师给大家十分钟的时间，结合桌上准备的实验仪
器进行测量吧。好，时间到，老师通过巡视发现同学们都参与其中，并且分工明确。现在我们找一组同学说一说，他们组的测量结果?第三小组代表请说。第三小组说通过实验发现，两次测量数据是一样的，都是 3V。那么通过实验，你能得出什么结论呢?他说，在只有一个用电器的电路中，用电器两端的电压与电源两端的电压相等。很好，请坐，看来你们观察得很仔细，总结得也很正确。
同学们，我们现在更换电阻，再次测量，看一看上述实验结果是否正确。老师看到
很多同学都已经展示了他们的测量结果，并且得出的结论与上述实验相同。
这节课马上接近尾声了，我们一起来总结一下，通过本节课的学习，都掌握了哪些
知识?我们重温了电压表使用方法及注意事项，并通过实验，知道了在只有一个用电器
的电路中，用电器两端的电压与电源两端的电压相等这一结论。
下课后，同学们试着想一想为什么电压表使用时要与被测用电器并联?
同学们，下课!

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  126. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/framework/src/think/log/Channel.php ( 3.89 KB )
  127. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/framework/src/think/event/LogRecord.php ( 1.02 KB )
  128. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/think-helper/src/Collection.php ( 16.47 KB )
  129. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/framework/src/think/facade/View.php ( 1.70 KB )
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  131. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/framework/src/think/Response.php ( 8.81 KB )
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  133. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/framework/src/think/Cookie.php ( 6.06 KB )
  134. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/think-view/src/Think.php ( 8.38 KB )
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  137. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
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  139. /yingpanguazai/ssd/ssd1/www/no.15386.cn/runtime/temp/97c957f747c268aee476c4e16775dd7c.php ( 12.06 KB )
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  1. CONNECT:[ UseTime:0.000547s ] mysql:host=127.0.0.1;port=3306;dbname=no_15386;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000721s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000343s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000629s ]
  6. SELECT * FROM `set` [ RunTime:0.000280s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000663s ]
  8. SELECT * FROM `article` WHERE `id` = 466653 LIMIT 1 [ RunTime:0.000470s ]
  9. UPDATE `article` SET `lasttime` = 1778665917 WHERE `id` = 466653 [ RunTime:0.019169s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.007665s ]
  11. SELECT * FROM `article` WHERE `id` < 466653 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000664s ]
  12. SELECT * FROM `article` WHERE `id` > 466653 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006399s ]
  13. SELECT * FROM `article` WHERE `id` < 466653 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012269s ]
  14. SELECT * FROM `article` WHERE `id` < 466653 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009686s ]
  15. SELECT * FROM `article` WHERE `id` < 466653 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001106s ]
0.133961s