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Electrical Engineering

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DC Circuit Analysis

Circuit Linearity and Resistor Behavior

Description

Circuit linearity describes how a circuit responds when its input changes. A linear circuit has an output that is directly proportional to its input. This behavior follows two rules: homogeneity and additivity.

Homogeneity means that if the input, or excitation, is multiplied by a constant factor...

Transcript

考虑一个连接到可变电压源的电阻器。当电压增加时,记录相应的电流值。

图示表明电压与电流之间存在线性关系。

电路参数在电压或电流变化时仍保持不变的这类电路称为线性电路。

线性电路由线性元件或线性独立电源组成,且满足齐次性和可加性特性。

该原理可用于电路建模,以在负载两端电压降发生变化时预测电源电流。

首先,确定通过负载电阻的电流以及顶部电阻两端的电压降。

接下来,获取中央支路的电压降,该电压降用于计算流经该支路的电流。应用基尔霍夫电流定律(KCL)可得到总电源电流。

当负载电压变化时,可通过将常数与原电流相乘并代入已知值来求得新的电源电流。

然而,线性原理不适用于功率计算,因为...