There are generally several items that need to be noted on the label of the power adapter (hereinafter called adapter). First, is the adapter model, for example, the adapter model is XVE-120100, it tells us several information, that is, its manufacturer, the main parameters, etc., XVE beginning is generally ## company code, 120100 is to show that the adapter is 12V1A, 050200 is 5V2A; The second is the adapter INPUT (input), generally used in China is AC100-240V~50-60Hz, which indicates that the adapter can work normally under 100V-240V AC voltage; The third is the adapter OUTPUT(output), DC 12V=1A, representing the rated voltage of 12V direct current, the highest current is 1A. Two numbers can be very quickly calculate the wattage of this adapter, for example, this adapter, voltage 12V* current 1A=12W (power), indicating that this power supply is 12W adapter.
Most laptop power adapters can be suitable for 100 ~ 240V AC (50/60Hz). Basically, most notebook computers have the power supply external, with a power cord and the host connection, which can reduce the size and weight of the host, only a few models have the power supply built in the host.
There is a nameplate on the power adapter, which marks the power, input and output voltage and current and other indicators, pay special attention to the range of input voltage, this is the so-called "travel power adapter", if the mains voltage is only 110V countries, this feature is very useful, some parallel notebook computers are only sold in the country of origin, Without this compatible voltage design, even only a single input voltage of 110V, it will burn out when plugged in under China's 220V mains voltage.