An AC powered source usually has a significant level (often several volts) of line frequency common mode voltage.

交流供电的源通常具有很高电平的电源频率共模电压(常常有几伏)。

youdao

NOTE: If the system is connected to AC power and an error has been detected, the LCD lights amber regardless of whether the system has been powered on.

注意：如果系统已连接到交流电源，并已检测到一个错误，液晶灯琥珀不论系统已接通电源。

youdao

About the power supply, the filaments can be powered by AC or DC except that the 3a5 (version 2 of the amplifier) requires a DC filament supply.

就电源而言，灯丝用交、直流供电均可，但是版本二中的3a5除外，它必须用直流供电。

youdao

It combines a 2-liter DOHC 16V Duratec (Atkinson cycle) engine and CVT with an AC synchronous motor powered by a 7.6kWh Lithium Ion battery.

ENGADGET

In addition to 300 hours of entertainment, ports for USBs MP3s, camcorders and cameras (and AC outlets to keep them all powered), Virgin Atlantic will also trial phone conversations on personal mobile phones later this year.

FORBES: Ready for On-Board Cell Phones?

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