本刊曾发表过“利用等效法改画电路图”的“顺藤摸瓜法”本文再介绍一种常用的有效方法:“抓两头拉伸法”.原例题:分别画出图1中 R_(AB)、R_(AC)、R_(CD)和R_(CB)的等效电路图.分析思路:1.要画 R_(AB)的等效电路图,用两手分别抓住 A、B 两头,设想导线是能伸缩的,然后上下拉展电路图,结果就会把图1的电路拉伸成图2的电路图,这个电路中各元件的连接关系十分清楚,很容易改画成常见的图3 This publication has published “Using the equivalent method of painting circuit diagram” “Changtu touch melon ” This article then introduces a commonly used effective method:“ grasp two stretching method ”. Original example title: draw the Figure 1 respectively Equivalent circuit diagrams for R_(AB), R_(AC), R_(CD), and R_(CB). Analytical Ideas: 1. To draw the equivalent circuit diagram of R_(AB), grab both A and B heads with both hands. Assuming that the wire is retractable, and then pull up the circuit diagram, the circuit of Figure 1 will be stretched into the circuit diagram of Figure 2, the connection of the components in this circuit is very clear, it is easy to change the common Figure 3