电压源和电流源同时存在时,如何分析电路

求帮忙求电压V1,V2,V3和电流I1I2I3需要用到什么定理和公式?
2025-01-22 19:45:16
推荐回答(5个)
回答1:

串联电阻的电压源可以等效变化成并联电阻的电流源,电流源的电流等于电压源的电压除以电阻;并联电阻的电流源可以等效变化成串联电阻的电压源,电压源的电压等于电流源的电流乘以电阻。

第一步就用了把串联0.5Ω电阻的12电压源等效变化成并联0.5Ω电阻的24A电流源,最后又变了回去。

扩展资料

"电路分析"是与电力及电信等专业有关的一门基础学科。它的任务是在给定电路模型的情况下计算电路中各部分的电流i和(或)电压v。电路模型包括电路的拓扑结构,无源元件电阻R,储能元件电容C及电感L的大小,激励源(电流源或电压源)的大小及变化形式,如直流,单一频率的正弦波,周期性交流等。电路分析分为稳态分析和暂态分析两大部分。

电路模型的状态始终不变(在-∞

参考资料:百度百科电路分析

回答2:

串联电阻的电压源可以等效变化成并联电阻的电流源,电流源的电流等于电压源的电压除以电阻;并联电阻的电流源可以等效变化成串联电阻的电压源,电压源的电压等于电流源的电流乘以电阻。

所谓电流源,是指在一定范围内,能够输出恒定电流的电源,同理,电压源则能够输出恒定电压。理想恒流源的内阻为无穷大,理想恒压源的内阻则为零。

但实际应用中不存在“理想”的电源,分析电路时,可将恒流源的有限内阻并联在恒流源的两端,这样就可将产生电流的部件分成理想恒流源和一个阻抗并联两个部分。同样,对于实际电压源,可以分为一个理想电压源和一个串联电阻。 

拓展资料:

电压源和电流源都是指“理想状态”。
电压源——不管风吹浪打,两端的电压不变。包括流过电压源的电流的大小和方向。
电流源——哪怕天崩地裂,流过它的电流不变,包括不管这个电流是它自己提供的,还是别人强加的。如果不给它提供通路,它两端的电压就无限升高,如果强加给它过大的电流,它的电阻就无限增大。

电流源的内阻相对负载阻抗很大,负载阻抗波动不会改变电流大小。在电流源回路中串联电阻无意义,因为它不会改变负载的电流,也不会改变负载上的电压。在原理图上这类电阻应简化掉。负载阻抗只有并联在电流源上才有意义,与内阻是分流关系。

参考资料来源:百度百科 电流源 

百度百科 电压源

回答3:

分析电阻两端的电压一定要搞清通过该电阻的电流。
u的大小要看流过1Ω的电流大小,此电路中,ab两点是断开的,所以8v电压源不产生电流,也没有电流通过它。而3A电流源的输出电流是固定不变的,只有1Ω电阻成为这3A电流的通路。故u=3A×1Ω=3V。

回答4:

哪有楼下说的那么复杂繁琐,一个节点分析法即可,令I2,I2支路那2个节点为同一个Un,电源负极为0节点,有:
(2+1/4+1/2)Un=12*2-5
解得Un=76/11,这个解出来后你想要啥都能求,比如I2=(76/11-0)/V2。

回答5:

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