Supplying power to arduino by 5V and 2A adapter Can I power my Arduino using a 5V/2A adapter by connecting it through the USB port?

More precisely, I have to run a module requiring 200mA but the aim is to make the laptop independent.
Amps are not "forced" through a circuit like volts are. A closed circuit draws as much power (in amps) as it needs, so the only problem you could ever have is having too little current and not too much. Seeing as your module draws 200ma 2 amps to power it is plenty.