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# §1  3 基尔霍夫定律 PowerPoint PPT Presentation

§1  3 基尔霍夫定律. 基尔霍夫电流定律 基尔霍夫电压定律. 基尔霍夫（ Gustav Robert Kirchhoff ， 1824 ～ 1887 ）， 德国物理学家. 基尔霍夫定律是电路中所有元件电流和电压应分别遵循的由其相互联接所规定的约束关系 [ 可称之为拓扑约束 (topological constraint)] 。. 电路术语 :. 支路 (branch) ：. 节点 (node) ：. 回路 (loop) ：. 网孔 (mesh) ：. 基尔霍夫电流定律 (Kirchhoff's current law ，缩写为 KCL).

§1  3 基尔霍夫定律

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### §13 基尔霍夫定律

• 基尔霍夫电流定律

• 基尔霍夫电压定律

Kirchhoff，

1824～1887），

KCL是电流连续性原理在集中参数电路中的表现形式。

KCL与元件的性质无关。

KVL是集中参数电路中任意两点间瞬时电压单值性的必然结果。

KVL也与元件的性质无关

• 例1

(1)如以节点④作为电位参

v① = u①④ =20 V

v② = u②④ = u②① + u①④

=（2+20）V =18 V

v③ = u③④ =12 V

v⑤ = u⑤④ =24 V

(2)如以节点①作为电位参考点，即 令v① = 0 V

v② = u②① = 2 V

v③ = u③① = u③② + u②① =(62)V = 8 V

v⑤ = u⑤① = u⑤② + u②① =( 62)V = 4 V

v④ = u④① = 20 V