Whats your specific question about it , How it works ? Rate of ppc ? I could be more helpfull , if you could be more specific in what your trying to learn ?
Well actually its based on the site you use "The content". Also the more important thing is that how you place your adsense on the site. SEO is the most important for all adv things also for adsense..
Adsense is not a problem; it is an opportunity -- for those who know how to follow rules, create a web site with quality content, and have the patience to let it work for them.
Like most things in life, I think adsense can be successful for anyone willing to work hard enough. It takes time, sure, but if you work hard, study yours and others' tactics, and revise, experiment, and refine your ways, you're bound to succeed sooner or later.