在物理中考试题中,常出现一类因电路中滑动变阻器的滑动,或开关的通断变化,而引起连在相应电路中的电流表和电压表的示数发生变化的热点题目,判断它们怎样变化,是综合性较强的问题,学生感到不易掌握,下面通过实例的剖析,谈谈电表示数变化的题型及其解法。 In the physics test questions, there often appear a class of hot topics that cause changes in the number of ammeters and voltmeters connected to the corresponding circuit due to the sliding of the sliding rheostat in the circuit, or the on-off change of the switch, and determine how they change. , is a comprehensive problem, the students feel difficult to grasp, the following analysis of the case by example, talk about the number of changes in the number of electrical representations and their solutions.