论文部分内容阅读
控制变量法对学生来说,是一种容易掌握,又非常实用的推理方法。它能帮助学生在分析、解决问题时,抓住问题的本质,使之主次分明,更具针对性。控制变量法,通过控制一些变量,使所要研究的变量关系突现出来。这里所谓的“控制”,就是用人为的方法使得不是问题研究对象的物理量保持不变或相等的关系,然后比较、研究所突现出来的两个变量之间的关系。例如,在研究导体的电阻与何种因素有关,进而阐述电阻的特性时,由于与导体电阻有关的物理量是很多的,于是,在实验时,可选取相同材料(如皆为镍铬导
The control variable method is a kind of easy to grasp and very practical reasoning method for students. It can help students seize the essence of the problem when analyzing and solving problems, making them more clearly and more focused. The control variable method, by controlling some variables, makes the relationship of variables to be studied emerge. The so-called “control” here is the use of human methods to make the physical quantities that are not the subject of the problem study remain the same or equal, and then compare and study the relationship between the two variables that emerged. For example, when studying the resistance of a conductor and what kind of factors are involved, and then elucidating the characteristics of the resistor, since there are many physical quantities related to the conductor resistance, the same material (for example, all nickel-chromium conductors) can be selected during the experiment.