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1、青岛版小学科学六年级下册通电的线圈（二）教学设计通电的线圈青岛版小学科学六年级下册通电的线圈（二）教学设计一、教学目标：1、让学生会制作电磁铁，知道电磁铁在通电条件下有磁性，断电条件下无磁性。2、知道影响电磁铁磁力大小的因素，并会做控制变量的探究性实验。3、培养学生科学探究的兴趣和态度。二、教学准备：铁钉若干、导线、一号电池、曲别针、课件等。三、教学过程：(一)激趣导入师：你们喜欢魔术吗？（出示铁钉）我用这根铁钉可以把曲别针吸起来，并且我还可以让它听话，让它吸就吸，让它放就放，你们信吗？教师边演示边介绍做法。师：很神奇吧，刚才我把导线绕在铁钉上，就形成了一个线圈，线圈接通电流后，就变成了一个通
2、电的线圈。（板书课题）师：刚才谁发现了通电线圈中的秘密了？（学生汇报）教师启发学生给通电的线圈取名。（板书：电磁铁）(二)指导学生做电磁铁，探究电磁铁磁力大小与什么因素有关学生根据提示制作电磁铁，教师巡视指导。问：做好了吗？你们组的电磁铁能吸起多少根曲别针来？（学生汇报）师：看来每个小组的电磁铁吸起曲别针的数量不同，吸起曲别针的数量多，我们就说它的磁力大；吸起曲别针的数量少，我们就说它的磁力小。（板书：磁力大小）教师启发学生提出关于磁力方面的问题，接着进行猜测，教师适时板书学生的猜测结果。师：你们小组打算选择哪个问题去研究，又打算怎样去研究呢？抓紧时间商量商量。（学生讨论交流，师巡视指导，学生
3、汇报，师启发其他小组修改、补充、完善）（学生探究活动，师巡视指导。） 汇报：1、你们小组选择哪一个问题进行的研究，又有什么发现呢？2、你们认为电磁铁的磁力大小与什么因素有关？ 教师简单小结影响磁力大小的相关因素。 (三)自由活动师：通过以上的研究，咱们发现了电磁铁这么多的秘密，你们能不能利用本节课所学的知识再来制作一个电磁铁，比一比，看哪个小组的电磁铁“力气最大”（制作活动）让各小组介绍使磁力变大的方法。小结：看来如果既增加了电池的个数，又增加了线圈缠绕铁钉的圈数，电磁铁的磁力会变得更大。（四）课下拓展师：电磁铁的磁力大小除了与串联电池的数量、线圈缠绕的匝数有关外，还与什么有关呢，老师把这个问
4、题留给同学们课下继续研究。结束语！祝大家学到有用的知识，提升自己的能力，实现自己的梦想，踏踏实实干好每一件事，为美好的明天而努力！168bojmpnh80fnjx5zq6vxezil8hp6bjz2exaup14t6ygybmoei6qv.firpa7j.9fse76.kz.fue1gd9x233zu2jcsa0z0i.2ue0panm0c5wnxu65.vb4abap20bd34torqv0xaj,rm1z57oedk27bo.j5cbrbgv4zu2inqpg8hmj2a6mg03qhhe33q8hifgsrbgdo3k8llr1lgtbc2yu045r5zbxc,lx6zr5q.1c6d
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