Power supplies connected to AC mains introduce harmonic currents in the utility.
电源供应器连接到交流电源引入谐波电流的效用。
In most cases it is derived from the AC mains by means of a transformer and rectifier.
大多数情况下直流电是从交流电通过变压器和整流器而来的。
The power supply of the system is provided by the batteries being measured and the standby batteries, solving the problem associated with AC mains turning off during battery discharging.
该装置不需外接电源,而是利用被测电池加备用电池提供系统电源,解决了由于放电阶段停电而引起的问题。
This is basically a reading of how efficient the PSU is at turning AC mains voltage into DC for your PC.
这基本上是一个如何在高效率的电源供应器变成直流电源为您的PC交流电压读数。