ORIGINAL: jetmech05
You'll notice that the down aileron will add lift like a flap, while the up aileron will kill lift like a spoiler. So yes at neutral they add to the wing area. And add and kill lift while in use. This is why you need a touch of elevator to compensate for the loss of lift
Yes. Another reason you need elevator in a turn is to turn the plane. Visualize a plane that's banked, which is how it will be flying after you use the ailerons. To turn the nose toward the direction you want to turn you need some up elevator.
This isn't just a trivial point about how airplanes fly; it has a practical application. If you are making a tight turn and you need to make it tighter (to stay in front of the flight line, for instance), you tighten the turn by using more up elevator. Beginners sometimes try to do it by adding aileron or rudder, and the usual result is to add to the roll, sometimes leading to an unintentional split S. Planes get broken that way.