The system generates a direct current, so using it to power DC devices locally is more efficient than switching to the alternating current needed to feed it back to the grid.
该系统产生的电流为直流电，所以用来驱动本地的直流点装置比将其转化为交流电输入电网来的更有效率。
2
In the knowledge system of alternatingcurrent, the restrictive relationships of some physics quantities are similar with those of mathematical Numbers.
在交变电流的知识体系中，一些物理量的制约关系，与数学中一些数量制约有着相似之处。
3
This paper briefly introduces a hardware system of the alternatingcurrent motor test of the platform with superior natural price ratio.