on this site you can find out how anything works
http://electronics.howstuffworks.com

1)  http://www.plasmatvscience.org/
this wed site is cool it show you thing about how plasma are made and the
 history behind them
2) http://www.lightbulbs.com/
 this wed site show you all different types of light bulbs and how they work
3 )http://www.physlink.com/Education/AskExperts/ae379.cfm?CFID=23739983&CFTOKEN=4aa7853d844046c-9C8E3EAA-15C5-EE01-B9289D7E22760A81
this web site is cool it has other link on it that you will like