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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提出了一种利用正弦交流电压和电流的瞬时值测量正弦交流电参量的新算法。

Adopting sinusoidal instantaneous voltage and current, a new algorithm for measuring sinusoidal electrical parameters has been put forward.

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