一、问题的提出在电表的使用中，都有一条规则“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，部分老师本身对此模糊不清，在一次实验公开课“用电流表和电压表测定电池的电动势和内电阻”中，... First, the issue raised in the use of electricity meters, there is a rule “select the appropriate range.” But what is appropriate? Because the word “appropriate” is a vague concept, it has no quantitative definition. Students actually find it difficult to grasp, and some teachers themselves are ambiguous. In an experimental open class, the battery is measured by ammeter and voltmeter. EMF and internal resistance",...