> heat generated in semiconductors is generated by the frequency with which heat is generated and then sunk

For people interested on this, RWT has a very good explanation of the way we build things now and why we do it, in their series "The stuff dreams are made of".

http://www.realworldtech.com/page.cfm?ArticleID=RWT050802020...

http://www.realworldtech.com/page.cfm?ArticleID=RWT090402005...