[pbeaul]

Well, I currently only have the USB cable plugged into the computer... I don't have the extra adapter that came with it plugged in.

Either way, so long as the voltage is correct the phone is going to draw however many amps it can get/needs to charge... the charging is regulated by the phone not the dock. Basically, there's no need to worry... this dock won't make your phone charge any faster than a wall/in-car charger would.