在恒定电流电路中,常常会由于某个电阻 的变化而引起整个电路中一系列电学量的变 化,即所谓的动态变化．分析此类问题时,由于 涉及变量较多,往往容易出错,但只要抓住变化 的原因,弄清变化趋势,则不难分析．常见变化 原因都是滑动变阻器的阻值变化,现就滑动变 阻器的三种常见接法作一小结． In a constant-current circuit, a series of changes in electrical quantity in the entire circuit, the so-called dynamic changes, are often caused by a change in resistance. When analyzing such problems, due to the large number of variables involved, it is often easy to make mistakes, but as long as you grasp the reasons for the changes and clarify the trends, it is not difficult to analyze. The common reason for this change is the change in resistance of the sliding rheostats. A brief summary of the three common methods of sliding rheostats is given.