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电学实验一直是高考的热点,解决电学实验的关键是掌握三种选择:①电流表内、外接法的选择;②变阻器接法的选择;③器材的选择,其中变阻器器材的选择和接法的选择又是一个难点,学生感到难以和掌握,因此有必要对这一问题加以分析,以求明晰思路. 一、变阻器接法的选择1.变阻器两种接法的电路图
Electrical experiments have always been the focus of the college entrance examination. The key to solving electrical experiments is to grasp three options: 1 selection of internal and external methods of ammeter, 2 choice of connection of rheostats, 3 choice of equipment, among which selection of rheostat equipment and selection of connection method It is also a difficult point, students feel difficult and mastered, so it is necessary to analyze this issue in order to clarify the idea. First, the choice of varistor connection method 1. The circuit diagram of varistor two connection methods