论文部分内容阅读
电阻是初中物理电学中的难点之一,也是中考重点考查的内容之一.同学们如能充分经历探究影响电阻大小的因素这一过程,体验物理方法的应用,必将有助于更好地掌握电阻的概念.一、提出猜想在探究影响电阻大小的因素时,我们观察导体,发现不同的导体其长度、横截面积和材料可能不相同.因而,可提出如下猜想:导体电阻大小可能与①导体的长度、②导体的横截面积、③导体的材料等有关.
Resistance is one of the difficulties in physics of junior high school and one of the key points in the exam.If students fully experience the process of exploring the factors that affect the size of resistance, to experience the application of physical methods will surely help better Grasp the conception of resistance I. PROGING CONCERNS When looking at the factors that affect the size of a resistor, we look at the conductor and find that the length, cross-sectional area, and material of the different conductors may not be the same, so the conjecture can be made that the size of the conductor resistance may be ① conductor length, ② conductor cross-sectional area, ③ conductor material and so on.