若加在电路中某元件两端的电压跟通过该元件电流的比值(表示该元件电阻的阻值)不是常数,而是随着所加电压的变化而变化,则此元件就称为非线性元件。比如白炽灯泡实际上就属于此类元件,它的电阻并非是一个常数。为了考查考生在新的情境下处理物理问题的能力,在近年的各地考试题中陆续出现了一些包含非线性元件的电路计算问题。在解答这类含非线性元件的电路问题时,关键是要充分利用已知的非线性元件的U-I图像,并根据电路的特点,确定相关元件的电压与电流应满足的关系,作出相关 If added to the circuit in a voltage across the element with the ratio of the current through the element (that the resistance of the element resistance) is not a constant, but with the applied voltage changes, the element is called non-linear element . For example, incandescent bulbs actually belong to such components, its resistance is not a constant. In order to test the ability of candidates to deal with physical problems under new situations, some computational problems of circuits including non-linear components have appeared one after another in exam questions in recent years. The key to solving such a circuit problem with non-linear components is to make full use of the U-I images of known nonlinear components and to determine the relationship between the voltage and the current of the relevant components according to the characteristics of the circuit and make the correlation