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一、电饭锅图１ 为电饭锅的原理图．煮饭时开关S 闭合，红灯亮；饭煮熟（当时温度约为１０３ °C ）后，保温时开关S 自动断开，黄灯亮．电阻R １ 的作用是保护红灯，使红灯不因电流过大而烧毁．R １ 与电饭锅的等效电阻R ０ 的大小
First, the rice cooker Figure 1 for the rice cooker schematic. The switch S is closed during cooking and the red light is on; when the rice is cooked (the temperature is about 103 °C), the switch S is automatically disconnected and the yellow light is on during the heat preservation. The role of resistor R1 is to protect the red light, so that the red light is not burned due to excessive current. R 1 and the equivalent resistance R 0 of the rice cooker