非线性元件是一种通过它的电流与加在它两端的电压不成正比的电路元件,即它的U-I图线是非线性的曲线。如白炽灯、光敏电阻、热敏电阻、警惕二极管、硅光电池等。由于I与U成非线性关系,所以非线性元件在工作时其电流I和电阻R均随电压U变化而变化,故求解非线性元件的功率,通常要借助辅助图线——某现象图线来寻找该非线性元件的实际工作点(即此时非线性元件在电路中的工作电压和电流)。下面以例说明, A non-linear element is a circuit element through which the current is not proportional to the voltage applied across it, ie, its U-I plot is a non-linear plot. Such as incandescent lamps, photoresistors, thermistors, vigilance diodes, silicon cells and so on. As I and U into a nonlinear relationship, so the non-linear components in the work of its current I and resistance R are changes with the voltage U changes, so solving nonlinear components of the power, usually with the help of the auxiliary line - a phenomenon map line To find the actual working point of the nonlinear element (ie, the operating voltage and current of the nonlinear element in the circuit at this time). The following example illustrates,