人教版高中物理3-2教材第5章第4节“变压器”中的“思考与讨论”中有一实验:演示变压器对交流电的作用,教材给出如图1参考电路图,笔者在教学实践中发现,此实验有拓展和改进的空间.1问题与改进电路图显示,实验使用的学生电源有交、直流两种输出,要求学生思考和讨论“一个线圈连到交流电源的两端,另一个线圈连到小灯泡上,小灯泡可能发光吗?”演示得到肯定结果后,学生必然会形成与上述成鲜明对比的 People Pupils High School Physics 3-2 textbooks Chapter 5 Section 4 “Transformer ” in the “thinking and discussion ” in an experiment: demonstration of the role of transformers on the AC, the teaching material is given in Figure 1 reference circuit, the author Found in the teaching practice, this experiment has room for improvement and improvement.1 The problem and improvement circuit diagram shows that the experimental power supply students have AC, DC two kinds of output, require students to think and discuss “a coil connected to the AC power supply two End, the other coil connected to the small bulb, the small bulb may glow it? ”Demonstrated positive results, the students will form a sharp contrast with the above