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第一,假变量让学生迷失方向.在探究电热大小与哪些因素有关的实验中,苏科版教材中就更改过好几次,就实验本身有很多细节值得推敲,其中就有假变量迷惑学生,让学生在实验和思考过程中迷失方向.例在“探究影响电流热效应的因素”活动中,海洋同学为了研究通电导体电阻的大小对产生热量多少的影响,设计的正确方案:选择两个阻值(相等/不等)的电阻丝,控制通过两个电阻丝的电流(相等/不等),通电时间相等,比较产生热量
First, fake variables let students lose their direction.In the study of electric heat size and what factors related experiments, Suke version of the teaching material changed several times, there are many details of the experiment itself worth considering, of which there are fake variables confused students, Let the students get lost in the experiment and thinking process.Examples in the “explore the factors affecting the current thermal effects ” activities, ocean classmates in order to study the size of the conductive conductor resistance on the amount of heat generated, the correct design of the program: choose two Resistance (equal / unequal) resistance wire, control the current through the two resistance wire (equal / unequal), the same electricity time, the more heat