教育科学版初中九下8.3电磁感应现象ppt课件.ppt

?第三节 电磁感应现象 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 学****目标? 1. 知道电磁感应现象及其产生的条件; ? 2. 知道感应电流的方向与哪些因素有关; ?3知道电磁感应现象中机械能转化为电能; ? 4. 知道交流发电机的原理。 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 引入课题?请同学们观察下面的实验后回答:此实验称为什么实验?它揭示了一个什么现象? Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 实验探究:磁是如何生电的不动动不动动不动 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 讨论: ?磁生电的条件有哪些? ?闭合电路的部分导体、?在磁场中运动?并且作切割磁感线运动 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 结论: ?电磁感应:闭合电路的部分导体在磁场中做切割磁感线运动时,导体中就会产生电流, 这种现象叫做电磁感应。所产生的电流叫做感应电流。 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 探究:感应电流的方向与哪些因素有关? ?结论: ?感应电流的方向与导体运动方向及磁场方向有关。 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 在电磁感应现象中能量是怎样转化的? ?机械能转化为电能。?专门把机械