2024/10/6第二章电路分析基础2024/10/62024/10/62024/10/62024/10/62.2电源的等效变换2024/10/62024/10/6例1:例2:2024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62.5叠加原理2024/10/62024/10/62.5叠加原理由图(c)，当IS单独作用时2024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62.6.1戴维南定理例1：解：(1)断开待求支路求等效电源的电动势E解：(2)求等效电源的内阻R0除去所有电源（理想电压源短路，理想电流源开路）解：(3)画出等效电路求电流I3例2：2024/10/62024/10/62024/10/62024/10/62024/10/62.6.2诺顿定理例1：2024/10/62024/10/62024/10/62024/10/62024/10/62024/10/62024/10/6