一、等效法所谓等效法就是当我们所研究的物理现象或规律很抽象或很复杂,但它们跟另一简单的物理现象或规律效果相同时,我们就可用简单的物理模型来代替,并保证物理意义、物理规律、作用效果不变.例1如图1所示的电例1如图1所示的电路中,电源电压为12V保持不变,当开关S1、S2断开 First, the equivalent method The so-called equivalent method is that when the physical phenomena or laws we are studying are very abstract or very complex, but they have the same effect as another simple physical phenomenon or law, we can use a simple physical model to replace and ensure The physical meaning, physical laws, and effects are not changed. Example 1 In the circuit shown in Fig. 1 as the example 1 shown in Fig. 1, the power supply voltage is kept at 12V, and the switches S1 and S2 are turned off.