I Was Wondering, a 10 Ports hub like this: http://www.orico.cc/goods.php?id=6225
With a 12V3A power, this mean a 36Watts, How this Watts are distributted to ports?

36Watts means 7.2A in a 5V, but are each port limited to an Amperage? or if you connect 3 ports only, those Amperes will be splited into these 3 ports?