OK then.
So lets say, for learning purposes, I want to turn a LED on and off. That's about 10-20mA. Of course I realize I'm not using an appropiate FET for something like that, but this is just for me to understand how it works.
According to the graph, 4v at the gate would be enough then, wouldn't it?
And in this case that would be regardless of the Drain voltage, right?
Another thing, what about the Vgs Threshold? Does it have something to do with all this?