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初中物理的“电流的定律”这一章,是电学的基础和重点。学好这章有利于后面电功率的学习。 这章主要内容是讲电流强度、电压和电阻这三个电学中最基本的概念。从它们之间的定量关系,引出电的基本规律——部分电路的欧姆定律,运用欧姆定律进行简单的串,并联电路的计算。这章的难点是:电学基本量电压、电流、电阻的概念较抽象,和力学中的物理量不同,没有实物作联想,而初中学生抽象思维的能力较差,
The “law of currents” chapter in junior high school physics is the foundation and focus of electricity. Learn this chapter is conducive to learning the back of the electric power. The main content of this chapter is about the basic concepts of current, voltage and resistance. From the quantitative relationship between them, the basic law of electricity is drawn - the Ohm’s law of some circuits, and Ohm’s law is used to calculate simple series and parallel circuits. The difficulty of this chapter is that the concept of basic voltage, current, and resistance of electricity is more abstract than that of mechanics. There is no physical association, and the ability of abstract thinking of junior high school students is poor.