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用一个矩形框表示“黑盒”,外面有几个接线柱,要求根据给定的电阻条件,画出盒内电阻的连接情况,这是各地中考及竞赛中经常出现的一类试题。本文拟对此类问题的解法进行探讨。 处理此类问题,有一定的思维技巧,其一般程序是“寻零——找小——配大”,即先寻找出两接线柱间电阻为零的支路,用导线直接连接起来;再通过比较已知接线柱之间的阻值情况,找出阻值最小的支路,将电阻画在相应处;最后
A rectangular box is used to represent the “black box”. There are several terminals on the outside. It is required to draw the resistance of the box according to the given resistance conditions. This is a kind of questions that often appear in the local examinations and competitions. This article intends to discuss the solution to this type of problem. To deal with such problems, there are certain thinking skills. The general procedure is to “find zero - find small - big”, that is, first find the branch with zero resistance between the two terminals and connect them directly with wires; By comparing the resistance between the known terminals, find the branch with the smallest resistance and draw the resistor in the corresponding place;