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在人教版义务教育课程标准(实验)物理教科书八年级下册第29页有这样一道题:某同学认为:I=U/R变形可得R=U/I。而R=U/I就表明,导体的电阻R跟它两端的电压成正比,跟电流成反比。我认为这是物理概念和数学概念的问题,让学生认识和区别这两个概念,对学生以后学习物理有很大的帮助。
In the PEP Curriculum Standard (Experimental) Physics textbook eighth grade volume on page 29 there is such a problem: Some students think: I = U / R deformation available R = U / I. R = U / I shows that the resistance R of the conductor is proportional to the voltage across it and inversely proportional to the current. I think this is a problem of the concepts of physics and mathematics. Students should recognize and distinguish these two concepts and help them to study physics in the future.