Ac Alternating current (ac) is electric current that alternates between a positive maximum value and a negative maximum value at a characteristic frequency, usually 50 or 60 cycles per second (Hertz).

交流交流是指电流在正负最大值之间以特定的频率变动，通常频率为50或60赫兹。

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We can also call it an 'alternator', because it generates alternating current (AC).

我们可以也称之为'发电机'，因为它产生交流电(AC)。

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

FORBES: Solar Microinverter Maker Enphase Gets A Boost In Distribution Deal With Siemens

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