等效电源,就是把电路中包含电源的一部分电路视为一个新电源。如果是电池和电阻相连接,则是把它们全体视为一个新电源,这时新电源的电动势E就是新电源的开路电压,新电源的内阻r就是新电源两端除源(将电动势短路而保留电源内阻)电路的总电阻。下面通过一些典型实例,介绍等效电源在直流电路分析和计算中的应用。一、分析测电源电动势和内阻实验误差 Equivalent power is the circuit that contains part of the circuit as a new power supply. If the battery is connected to the resistor, then they are all considered as a new power supply, then the new power of the electromotive force E is the new power supply open-circuit voltage, the new power supply internal resistance r is the new source at both ends of the source (the electromotive force short While retaining the power supply internal resistance) total resistance of the circuit. The following through some typical examples, describes the equivalent power in the DC circuit analysis and calculation of the application. First, analysis of power supply emf and the experimental error of internal resistance