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在系统复习过程中,根据复习的范围,可以指导学生设计一些不同方案的实验练习,把学习中的基础知识和实验技能通过实验设计联系起来,以加强学生对知识结构的理解。例如复习高二“稳恒电流”一章时,我们组织了一堂以“测定电流表内阻”为中心的实验设计复习课,让学生应用学过的知识来设计多种实验方案。提出思考题:能否用测导体电阻的方法来测定电流表的内阻?如果能的话,该注意什么?在学生思考、分析的基础上得出:因为电流表有极性,所以电流应从正极流入。测量时流过表头的电流不大于满度电流。由于电流表满度电流一般是几百微安,所以测量电流是很小的。学生
In the process of reviewing the system, according to the scope of the review, students can be guided to design some experimental exercises of different programs, and the basic knowledge and experimental skills in the learning are linked through experimental design to enhance students’ understanding of the knowledge structure. For example, when reviewing the chapter “Constant Current” in the second year of high school, we organized an experimental design review class centered on “measuring the internal resistance of the ammeter” to allow students to apply the learned knowledge to design a variety of experimental programs. Ask the question: Can you use the method of measuring conductor resistance to determine the internal resistance of the ammeter? If possible, what should you pay attention to? Based on students’ thinking and analysis, because the ammeter has polarity, the current should flow in from the positive electrode. The current flowing through the meter during measurement is not greater than the full-scale current. Since the ammeter full-scale current is typically a few hundred microamps, the measured current is very small. student