在讲解电动机原理前,教师都要先通过图1的实验,向学生讲清通电导体在磁场中受力.实验现象虽然很明显,但总认为本节的概念输入比较突然.即使教师说明了:通电导体之所以受力是因为通电导体产生的磁场与周围的外磁场产生了力的作用这一原理,但师生还是感觉本节内容与教材前面一节的奥斯特实验(电生磁)联系不强.图1如果换一种讲解方式,以奥斯特实验为突破口,利用力的相互性、惯性等原理,讲解通电导体在磁场中受力时就显得自 Before explaining the principle of the motor, teachers must first pass the experiment in Figure 1, to clarify to the students energized conductor force in the magnetic field. Although the experimental phenomenon is obvious, but always consider this section the concept of input more abrupt .Even if the teacher states: The reason why the power conductor is stressed is that the magnetic field generated by the conductive conductor and the external magnetic field around the force generated by this principle, but teachers and students still feel the contents of this section and teaching materials, the previous section of the Oersted experiment (electrospinning) Contact is not strong.Figure 1 If for a different way to Oersted experiment as a breakthrough, the use of force of mutualism, inertia and other principles, to explain the conductor when the force in the magnetic field appears to be self