在解决恒定电流的有关问题时,我们常常会遇到电路中仅某一部分发生变化,其余部分固定不变的情况,而固定部分又往往有关数据未知或连接情况比较复杂,在此情况下,采用常规的方法来解决问题会较为繁琐、复杂,甚至相当困难;若采用“等效电源法”,即用一个等效电源来代替固定部分,会给解题带来很多方 When solving the problems related to the constant current, we often encounter the situation where only a certain part of the circuit changes and the rest is fixed. However, in the fixed part, the relevant data is often unknown or the connection is more complicated. In this case, the Conventional methods to solve problems can be tedious, complicated, and even difficult; if the “equivalent power method” is adopted, that is, using an equivalent power source instead of a fixed part, many problems will be brought to the solution.