在不能直接用这两个基本部件表示时，提出用克希荷夫电流定律来作出其信号流图。
When the two basic devices can't be directly shown, Kirchhoff's current law may be used to make its signal flow graph.
基尔霍夫电流定律，由古斯塔夫·基尔霍夫1845年证明，规定在某一波节的电荷输入与电荷输出相等。
Kirchhoff's current law, described by Gustav Kirchhoff in 1845, states charge input at a node is equal to the charge output.
电流：电流，欧姆定律，电导率，基尔霍夫定律，时变电流，自由和强迫振荡，电容器，电感，复阻抗，谐振电路。
Electric currents: electric current, Ohm's law, conductivity, Kirchhoff's laws, time varying currents, free and forced oscillations, condensers, inductance, complex impedance, resonant circuits.
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