正弦交流电路是交流电路的一种最基本的形式，指大小和方向随时间作周期性变化的电压或电流。
文章介绍一个用节点分析法计算正弦交流电路的程序。
A program based on the node analysis method which can be used to compute Sine AC-Circuit is described.
谐波理论分析对于非正弦交流电路的研究具有重要的理论和实际意义。
The analysis of modulation wave theory has very important theoretical and actual meaning for studying non sine alternating current.
由功率四边形进一步确立了非正弦交流电路中的电流四边形和导纳四边形，以及它们和功率四边形的相似关系。
Further, the current quadrilateral and admittance quadrilateral, as well as their similarity to the power quadrilateral in non-sinusoidal alternating-current circuits were derived.
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