电表示数变化问题一直是欧姆定律的教学重点和难点,也是中考中重要的考点之一,这类问题如何进行突破?根据学生的认知情况及课标的要求,以学习目标为出发点,以问题链的呈现为载体使学生的知识和能力得到螺旋式上升和提高。问题链的设置不是简单问题的罗列,而是相互关联,能将物理知识和方法串成线的一些列由浅入深的问题组,通过这些问题组的讨论,化解教学难点形成解题的思路和方法,使学生的知识和能力得到提升,通过变 How to make a breakthrough in such problems? According to the students’ cognition and the requirements of the course standard, taking the study goal as the starting point, taking the problem as an example, The presentation of the chain as a carrier allows students to spiral up and increase their knowledge and abilities. The setting of problem chains is not a list of simple problems but interrelated ones. Some of the columns of physics knowledge and methods can be grouped into a series of simple questions. Through the discussion of these problem groups, Methods to enable students to enhance their knowledge and ability, through the change