Rephrase that, you read a book on electronics and didn't grasp the concept. I'm an electrical engineer. If I really need to dig up some literature on the basics of electronics for you, I will. Yes, if you run too many amps through a conductor that can't support it, you're going to fry shit. But the PS2 is the load for the DC adapter, it will only ask for as many fucking amps as it needs.
If there aren't enough amps then it will draw the max while still asking for more, overheating the adapter (or just plain not working). However, if the adapter can provide (it doesn't fucking matter here) a million amps, the PS2 asks for 5.6 amps, that's all the fucking adapter is going to give it. Why? Because the adapter doesn't continuously pump amps through it, it only pumps voltage, the load controls the amps.
If you need more of a lesson please PM me and quit making yourself look stupid.
Edit:
Electronics Lesson for you about Voltage and Amperage in adapters.