Alternating current (AC) : Flow of electric charge that reverses periodically, unlike direct current.

交流电：周期性换向的电流，和直流电不一样。

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It is intended primarily for alternating current (ac) power use, but has enough battery back-up power for an hour of operation.

该设备主要适用于交流电源(AC)，但是配备的电池储备电源足够使用1小时。

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Inverters and microinverters convert the direct current (DC) power produced by solar panels into alternating current (AC) used in homes and businesses.

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Since 2005, the company has stood out in the fast-moving LED industry with an innovation that allows LEDs to be powered by alternating current, or AC, rather than requiring a transformer that turns AC into direct current.

WSJ: Seoul Semiconductor's LED-Lighted Path