一、开关状态的“穷尽讨论”例1(2004年北京市)如图1所示的电路中,电源电压为220V。R1、R2、R3 为定值电阻,但是它们的具体电阻值都没有标注,知道它们的电阻的可能值是44Ω、88Ω、17Ω或220 Ω.闭合开关S,在断开S1、S2与闭合S1、S2两种状态下,电流表的示数之比为1:10,电路消耗的电功率有四种可能 First, the “exhaustive discussion” of the switch state Example 1 (2004 Beijing) In the circuit shown in Figure 1, the power supply voltage is 220V. R1, R2, and R3 are fixed-value resistors, but their specific resistance values ​​are not labeled. Knowing that their possible values ​​of resistance are 44Ω, 88Ω, 17Ω, or 220Ω, the switch S is closed, and S1, S2, and S1 are closed. In the two states of S2 and S2, the ratio of the current meter is 1:10. There are four possible electrical power consumed by the circuit.