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如图1所示的U—Ⅰ图象中,直线①表示闭合电路中电源的路端电压随电流的变化图线,直线②表示定值电阻R的电压随电流的变化图线,两图线的交点A表示此电源向该电阻R供电时(图2)电路的工作状
In the U-I image shown in FIG. 1 , the line 1 represents the graph of the road-end voltage variation with the current of the power supply in the closed circuit, and the line 2 represents the graph of the voltage-versus-current variation of the setting resistor R. Two graphs The intersection point A indicates the working condition of the circuit when the power is supplied to the resistor R (Fig. 2).