一、演示原理及基本器材电磁振荡是章节的重点，其概念比较抽象，研究的是看不见摸不着的电磁场及其运动．在这种情况下，为便于学生理解和接受，做好课堂演示，就显得十分重要．我校实验室现有J2434电磁振荡演示仪教具，原理如图1，教学效果不理想．由于电感线圈电阻不够小， First, the demonstration principle and the electromagnetic oscillation of the basic equipment are the key points of the chapter. The concept is relatively abstract. It is the invisible electromagnetic field and its movement. In this case, it is very important for students to understand and accept and do a good presentation in class. Our school’s existing J2434 electromagnetic oscillation demonstrator teaching aids, the principle shown in Figure 1, the teaching effect is not ideal. Because the inductance of the inductor is not small enough,