ac\/dc adaptor means AC\/DC adapter.
The appearance of the common AC power adapter is usually matched with the AC symbol, and the DC power adapter is DC. The inside of the AC adapter is mainly through the power transformer to complete the conversion output, and the inside of the DC adapter is composed of the rectifier circuit. The AC power adapter has a copper core inside, and when working, the power consumption will be lost in the form of useless work, and the input voltage range of the wire package power supply is very narrow, which can not adapt to a variety of use environments. The common DC power supply is the internal adapter is composed of rectifier IC chip and filter circuit, the loss will be much lower.