笔者近日观摩了一节市级公开课,课堂上授课老师和学生分析解决有关电磁感应问题,在研究安培力做功与焦耳热的关系时,老师给出一个结论:安培力做功大小等于焦耳热。笔者觉得此结论不太妥当。我们平时接触的电磁感应问题比例多的是:导体棒(或闭合线圈的部分导线)通过克服安培力做 The author recently observed a municipal open class, classroom teachers and students to analyze and solve the problem of electromagnetic induction, Ampere force work in research and the relationship between Joule heat, the teacher gives a conclusion: Ampere work size equal to Joule heat. I think this conclusion is not appropriate. We usually contact the electromagnetic induction problem is the proportion of more: conductor bar (or part of the coil wire) through the Ampere force to do