在众多的欧姆定律应用的习题中,有一类令学生头痛,也是教学难点的题目,就是判断电表示数变化,对于这种类型的问题,现提供解题方法和思路如下: 一、由于滑动变阻器滑片的移动,导致电表示数变化1.串联型例1 如图1,电源电压 Among the many problems in the application of Ohm’s Law, there are one type of problems that make students have headaches and are difficult to teach. They are to judge the changes in the number of electrical representations. For this type of problem, the methods and ideas for solving problems are provided as follows: I. Due to the sliding rheostat The movement of the slide leads to a change in the number of electrical representations. 1. Serial Type 1 As shown in Figure 1, the power supply voltage