在电学实验题电表的选择中,常有一条规则“选取适当的量程.”但怎样才算合适?由于“适当”两字属于模糊概念,它本身没有量的界定,学生实际操作起来,感到很难把握.对此,教师一般告诉学生如下结论:电流表及电压表这两种电表的适当量程应是使指示值接近满偏的2/3以上为好;欧姆表的 In the electrification of electricity test questions, there is often a rule “to select the appropriate range.” But what is appropriate? Since the word “appropriate” is a fuzzy concept, it has no quantitative definition, and students actually feel it. Difficult to grasp. In response to this, teachers generally tell students the following conclusions: The appropriate ranges for ammeters and voltmeters should be such that the indicated value is closer to 2/3 of full deviation; ohmmeter’s