本章内容实际上就是三个演员(电流、电压、电阻)在一个舞台上(电路图,如图1)演出了很多精彩的节目,这些精彩的节目主要内容有:(1)研究电流跟电压、电阻的关系;(2)欧姆定律;(3)“伏安法”测电阻;(4)欧姆定律在串、并联电路中的应用.下面从课标要求、方法点拨和例题分析三个方面 The content of this chapter is actually three actors (current, voltage, resistance) performing a lot of wonderful programs on a stage (circuit diagram, as shown in Figure 1). The main contents of these exciting programs are: (1) Research on current and voltage, resistance (2) Ohm’s law; (3) “Voltammetry” measuring resistance; (4) Ohm’s law in string and parallel circuit applications. The following three aspects from the standard requirements, methods, and example analysis