Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Network Theorems

网络定理

Solving for currents and voltages in multi-loop electric circuits can be quite complicated, particulary for AC circuits. The voltage law and current law always apply, but using them may lead to long systems of equations. Certain theorems help with network analysis:

求解多回路电路中的电流和电压可以相当复杂，尤其是交流电路。电压定律和电流定律始终适用，但使用它们可能导致很长的方程组。某些定理有助于网络分析：
Superposition Theorem
For multiple-source circuits, the circuit current from each source can be calculated individually, and the results added (superimposed).
叠加定理 对于多源电路，可分别计算每个电源的电路电流，然后将结果相加（叠加）。
Thevenin's Theorem
Combinations of voltage sources and impedances with two terminals can be replaced by a single ideal voltage source and a series resistor.
泰文纳定理：具有两个端子的电压源和阻抗的组合可以被一个理想的电压源和一个串联电阻所替代。
Norton's Theorem
Combinations of voltage sources and impedances with two terminals can be replaced by a single ideal current source and a parallel resistor.
诺顿定理：具有两个端子的电压源和阻抗的组合可以等效为一个理想的电流源和一个并联电阻。
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AC Circuits
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AC Circuit Applications

AC电路应用
Filter circuits
滤波电路
Transformers
变压器
AC Motors
交流电机
Household Wiring
家庭布线
Voltage Divider
电压分压器
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 Index

AC Circuits
索引 AC 电路
 
HyperPhysics***** Electricity and Magnetism
HyperPhysics ***** 电学和磁学
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