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等效电源定理可表述为两端有源网络可等效于一个电源,其电动势等于网络的开路端电压,内阻等于从网络两端看除源(除去电动势)网络的电阻。其中“网络”泛指电路或电路一部分的术语。若网络中含有电源则称为有源网络。现举例说明:例1如图1所示,电源内阻E=6 V,r=1Ω,R_1=2Ω,R_2=6Ω,灯L上标有“3 V、1.5 W”的字样,当滑动阻器的P_b段电阻多大时,变阻
The equivalent power theorem can be expressed as that the active network at both ends can be equivalent to a power supply, the electromotive force is equal to the open-circuit voltage of the network, and the internal resistance is equal to the resistance of the network except the source (excluding the electromotive force) viewed from both ends of the network. Where “network” refers to a term that is part of a circuit or circuit. If the network contains power, it is called an active network. Here is an example: Example 1 shown in Figure 1, the power supply internal resistance E = 6 V, r = 1Ω, R_1 = 2Ω, R_2 = 6Ω, the lamp L marked with “3 V, 1.5 W ” words, when What is the resistance of the P_b section of the sliding resistor?