物理特级教师郑青岳老师来我校听课调研时指出:W=qU 与 q=It 中两个“q”的含义是有差别的,不能不加分析地直接认为两者相同;当然,如果稀里糊涂地过去,学生一般很难发现这个问题,但却有悖于“物理要说理”这个价值观教育原则,物理规律的推导必须是科学而严谨的.所以,如何让学生更好地理解两个有差别的“q”相等,是一个值得研究的问题,针对上述问题,笔者对人教版新老教材中有关电功表达式 Teacher Zheng Qingyue, a teacher with a special physical grade, came to our school and pointed out in the course of research that: There are differences in the meaning of the two “q” in W=qU and q=It. I cannot directly think that the two are the same without analysis; of course, if I am confused In the past, students generally found it difficult to find this problem, but they were obsessed with the principle of “physics to reason,” and the derivation of the laws of physics must be scientific and rigorous. So, how can students better understand the two? The difference between “q” and “equal” is an issue worthy of study. In response to the above problems, the author has used the expression of electric power in the old and new teaching materials of PEP.