变阻器一节是人教版九年级物理第十六章第四节的内容,本人通过多次对这一节教学的积累和学生反馈的信息作如下反思,以供同仁探讨。1.这一节内容,理解变阻器的原理是本节的重点,为突破这一重点,教材中是这样设计的:通过这样一个演示实验:将一根较长的铅笔芯、小灯泡、电源串联起来,这是一个不完整的电路,电路中没有开关,因此会导致电能浪费,不利培养学生节能意识。2.为突破变阻器原理这一重点,老师要精细准备。我是这样做 Rheostat section is the content of the fourth chapter of Chapter XIX of the PEP teaching plan. I made the following reflection on the accumulation of teaching in this section and the feedback from students for my discussion. 1. This section, to understand the principle of rheostat is the focus of this section, to break through this point, the textbook is designed this way: Through such a demonstration experiment: a long pencil lead, light bulbs, power in series Up, this is an incomplete circuit, there is no switch in the circuit, so it will result in the waste of electric energy and adversely affect students’ awareness of saving energy. 2. To break the rheostat principle of this focus, the teacher should be carefully prepared. I did it