变阻器是一个很重要的电器元件。在以后的实验和电学计算中都要用到它。由于滑动变阻器不同于一般的电器元件,它有四个接线柱,选用不同的接线柱,它连入电路中的部分就可能不同。因此,变阻器教学又是教学中的一个难点。要攻破这一难点,必须使学生真正了解变阻器的构造和原理。为此,我设计了这堂通过系列学生实验进行的变阻器教学,课堂上具体进行的方式是:学生在教师指导下实验、观 Varistors are a very important electrical component. It is used in later experiments and electrical calculations. Since the sliding rheostat is different from the general electrical components, it has four terminals, and different terminals are used. It may be different in the portion that is connected to the circuit. Therefore, varistor teaching is a difficult point in teaching. To overcome this difficulty, students must really understand the structure and principle of varistors. To this end, I designed this varistor teaching through a series of student experiments. The concrete method in the classroom is: Students under the guidance of teachers, experiment, view