电源的U-I图象表述的是电源的路端电压随电路电流的变化关系,图象上每一点对应的U、I的比值表示外电阻的大小,不同点一一对应的外电阻大小不同。根据表达式U=E-Ir画出的图象为电阻的U-I图象表述的是电阻两端电压随电阻中电流的变化关系,图象上每一点对应的U、I的比值表示电阻的大小。如果 The U-I image of the power supply shows the relationship between the voltage of the power supply and the current of the circuit. The ratio of U and I at each point of the image indicates the size of the external resistor. The external resistors of different points are different in size. According to the expression U = E-Ir draw image for the resistance of the UI image is the resistance of the voltage across the current resistance changes at each point of the image corresponding to the U, I said the ratio of the size of resistance . in case