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电学仪器的选择一直是全国各地高考的热点和重点,其中滑动变阻器的选择和连接是高考实验题中重中之重,面对2007年江苏物理卷中的电学实验题中的滑动变阻器题的高出错率,笔者根据自己近二十年的教学经验,对滑动变阻器的选择和连接作详细的总结,以往的文章只是笼统地介绍两种接法以及滑动变阻器的理论分析,没有涉及各种情况的分析,结果学生遇到了新题又处于迷茫状态,导致似懂非懂,2007年高考实验题就是一个典型的例子。笔者不多介绍较多的理论,而是从帮助学生做题的角度出发总结一下,是否适用,只能由各位老师去点评了。
The choice of electrical instruments has always been a hotspot and focus of college entrance examinations across the country. The selection and connection of the sliding rheostats is the highest priority in college entrance examination experiment questions, and it faces the height of the sliding rheostat problem in the electrical experiment in Jiangsu Physics Volume in 2007. Error rate, the author according to their nearly twenty years of teaching experience, the sliding rheostat selection and connection for a detailed summary, the previous article is only a general introduction to the two connections and sliding rheostat theoretical analysis, does not involve a variety of situations As a result of the analysis, the student encountered a new problem and was in a state of confusion, resulting in a misunderstanding. The 2007 college entrance examination experiment was a typical example. The author does not introduce more theories, but summarizes them from the perspective of helping students to do the questions. Whether they are applicable can only be reviewed by the teachers.