Just to clarify:

  • The ‘100VAC’ most likely refers to the input. (My adapter has ‘100-240VAC’ on it, meaning it would work in Europe (generally around 220V), and US (generally 110V).)
  • The ‘2A’ is the maximal current that the adapter can supply. This is the “amount of electricity” the device consumes. If your device asks for less than this, all good (e.g. all the small GL-iNet routers will never ask for more that 1A unless they’re broken). (BTW, if your device asks for more, a good adapter will either limit to 2A or shut down, a bad adapter will burn out.)