当前位置:首页>课件>【科学教师编面试辅导 优质课件 评职称】冀人版六上《电磁铁》逐字稿试讲稿说课稿教学设计,定制参赛及微课

【科学教师编面试辅导 优质课件 评职称】冀人版六上《电磁铁》逐字稿试讲稿说课稿教学设计,定制参赛及微课

  • 2026-04-28 06:18:48
【科学教师编面试辅导 优质课件 评职称】冀人版六上《电磁铁》逐字稿试讲稿说课稿教学设计,定制参赛及微课

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电磁铁逐字稿

师:同学们,今天我们要走进一个奇妙的物理世界,去认识一种能将电和磁巧妙结合的装置——电磁铁。它藏在我们生活的诸多角落,有着千变万化的本领,今天就让我们一起揭开它的神秘面纱。

师:大家先看眼前的这个实验现象,仔细观察,铁钉此刻能稳稳吸起回形针,可当电路断开,回形针又齐刷刷掉落。这奇妙的变化背后,藏着电磁铁最核心的特性。通电后,铁钉拥有了吸引铁制品的能力;断电后,这份能力便消失无踪。换句话说,通电时,电磁铁产生磁性;断电后,磁性就会消失。而从能量的角度来看,电磁铁更是一个神奇的转化器,它能将电能转化为磁能,这也是它能实现磁生磁灭的关键所在。

师:想要探究电磁铁的奥秘,我们首先要弄清它的结构。看似复杂的电磁铁,其实由三个核心部分构成,分别是线圈、铁芯和电池。铁芯是它的骨架,线圈缠绕在铁芯之上,电池则为整个装置提供能量,三者相互配合,才能让电磁铁拥有独特的本领,少了其中任何一个,都无法组成一个完整的电磁铁。

师:了解了结构,接下来最有趣的环节来了——我们亲手制作一个电磁铁。大家一定要牢记实验要求,第一步,用导线在铁钉上沿着同一方向缠绕,注意哦,绕一圈就算一匝,缠绕的方向可不能随意改变;第二步,将导线的两端连接电池,之后用铁钉的一端去吸引回形针,这里有个重要的小提醒,通电的时间千万不宜太长,看完吸起的回形针后要立刻断电,再数清楚回形针的数量;第三步,实验完成后,每个小组派一名代表,把你们小组吸起回形针的数量汇报给老师。实验结束后,也别忘了检查和回收实验仪器,做爱护器材的小能手。

中间省略许多字……

师:相信大家都严格按照实验方案和要求完成了实验,也整理好了实验数据。现在我们一起来总结实验结论。首先看线圈匝数的影响,当其他条件相同时,线圈匝数越多,电磁铁吸起的回形针数量就越多,也就说明它的磁力就越强;反之,线圈匝数越少,电磁铁的磁力就越弱。再看电池节数的影响,同样的,当其他条件相同时,电池节数越多,电磁铁的磁力就越强;电池节数越少,电磁铁的磁力就越弱。这两个结论,就是我们这次实验最核心的发现。

师:认识电磁铁的特性和影响磁力的因素,我们再来看看它在生活中的应用。电磁铁的本领可不小,在工业、生活等诸多领域,都能看到它的身影,电磁起重器就是其中非常典型的应用。电磁起重器正是利用了电磁铁通电有磁性、断电无磁性的特性,工作时,接通电源,电磁铁产生强大的磁力,就能轻松吸起沉重的钢铁材料,将其运送到指定位置;到达位置后,断开电源,磁性消失,钢铁材料便会稳稳落下,大大提高了钢铁搬运的效率,也让操作变得更加便捷。

师:其实电磁铁的应用远不止于此,生活中还有很多地方藏着电磁铁的身影,比如电磁继电器、门铃、起重机等等。今天我们一起认识了电磁铁,探究了它的特性、制作方法和影响磁力的因素,也了解了它的应用。希望大家课后能继续留心观察生活,去发现更多电磁铁的奥秘,也能尝试利用电磁铁的特性,做一些有趣的小发明、小实验,让科学探索的脚步一直向前。今天课就上到这里

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  1. CONNECT:[ UseTime:0.000567s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000820s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000292s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000300s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000666s ]
  6. SELECT * FROM `set` [ RunTime:0.026892s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000986s ]
  8. SELECT * FROM `article` WHERE `id` = 480538 LIMIT 1 [ RunTime:0.000468s ]
  9. UPDATE `article` SET `lasttime` = 1777454609 WHERE `id` = 480538 [ RunTime:0.015553s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000373s ]
  11. SELECT * FROM `article` WHERE `id` < 480538 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006439s ]
  12. SELECT * FROM `article` WHERE `id` > 480538 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000511s ]
  13. SELECT * FROM `article` WHERE `id` < 480538 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005354s ]
  14. SELECT * FROM `article` WHERE `id` < 480538 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005357s ]
  15. SELECT * FROM `article` WHERE `id` < 480538 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008049s ]
0.146552s