图1krER 在复习恒定电流部分和物理竞赛辅导中常遇到闭合电路中电功率的求解,特别是动态功率极值。用函数法求极值有时很麻烦,甚至在实际操作中几乎是不可用的。下面介绍一下用“等效电源”法巧解闭合电路中的电功率,和广大同仁一起探讨。为了便于理解,不妨从设定 Fig. 1krER often encounters the solution of electric power in a closed circuit during the review of the constant current section and the physics competition coaching, especially the dynamic power extremum. Finding extrema using the function method is sometimes cumbersome and almost impossible even in actual operation. The following describes the use of “equivalent power” method to solve the closed circuit electric power, and the majority of my colleagues to discuss together. For ease of understanding, consider setting