First, is the type of adapter, for example, a adapter model is XVE-120100, it tells us some information, it is the manufacturers, Watts, XVE at the beginning of the general is the ## company code, 120100 is that the adapter is 12W, 050200 is 10W;
Second, is the adapter INPUT (input), the general in China is 100-240V~50-60Hz, which means that the adapter can work under the voltage of 100V-240V normal;
Third, is the adapter OUTPUT (output), two figures can quickly calculate the adapter watts, such as this adapter, voltage 12V* current 1A=12W (power), indicating that the power supply is 12W adapter.
Most laptop power adapters are suitable for 100 to 240V alternating current (50/60Hz). Basically, most laptops put power outside and connect them with a power line to the host, which reduces the size and weight of the host, and only a handful of models put the power into the mainframe.
There is a nameplate in the power adapter, marked power, index input and output voltage and current, with particular attention to the range of input voltage, this is the so-called "Travel Adapter", if the voltage is only 110V of the state, this feature is very useful, some smuggled goods notebook computer it is only at the origin of sales, not the compatible voltage design, single input voltage or even only 110V, plug will in 220V voltage in China under fire.