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非线性元件的电阻随外界条件的变化而变化,电流与电压不成正比,伏安特性图线不是直线而是曲线。欧姆定律对非线性电阻不适用,因此求非线性元件的功率通常是通过找出元件的“工作点”(工作时对应的电压和电流)再利用P=UI求解。下面笔者从一道竞赛题说起谈谈非线性元件功率的求解。
The resistance of the nonlinear element changes with the change of the external conditions. The current and the voltage are not proportional to each other. The volt-ampere characteristic curve is not a straight line but a curve. Ohm’s law does not apply to non-linear resistors, so the power of a non-linear element is usually found by finding the “operating point” of the element (the corresponding voltage and current at work) and reusing the P = UI. Now I talk about a race from the talk about the power of nonlinear components solution.