A few good sites that helped me understand
 

A few sites that should help noobies understand in case you guys are having trouble with your homework. I'm still a noob and they helped me. The how stuff works site to is the best one

http://auto.howstuffworks.com/turbo.htm
http://www.boatmall.com/Learn/TurboCharger.htm
http://auto.howstuffworks.com/turbo4.htm