在中学物理直流电路教学中,解不少习题需要将复杂电路简化得眉目清楚、一目了然,以便分析和计算.而不少学生由于对串联、并联及混联电路的特点不能熟练掌握,特别是由于缺乏想象能力,所以对一些习题束手无策.教师在讲解这类例题时往往硬性注入,很难得心应手.例如计算图1所示的AB间电阻R_(AB) In the teaching of physics DC circuits in middle schools, solving a lot of exercises requires simplifying the complex circuit and making it easy to understand and calculate at a glance. Many students cannot master the characteristics of series, parallel, and hybrid circuits, especially because Lack of imagination ability, so helpless to some exercises. Teachers often inject these examples of hard injection, it is difficult to handy. For example, calculate the inter-AB resistance R_(AB) shown in Figure 1.