在纯电阻电路中,可以将任一电阻看成唯一的“外电阻”,而将电路的其它部分看成一个新的电源,即等效电源,这样,该电路简化为一个基本电路.由于一般电路最终可以简化为串联电路或并联电路,所以本文以串联电路和并联电路为例来讨论电源的等效问题. In a purely resistive circuit, any resistor can be considered as the only “external resistance”, and the rest of the circuit is considered as a new power source, ie, the equivalent power source, so that the circuit is simplified as a basic circuit. The circuit can be reduced to a series circuit or a parallel circuit in the end, so this article discusses the equivalent problem of the power supply by taking the series circuit and the parallel circuit as examples.