How can I calculate the energy output from spinning a wheel at a certain RPM?

[ANarwhal]

How can I calculate the amount of energy I would get if I spun a wheel at a certain about of RPM? I know this is a general question, but I am looking for any kind of calculation I can use.

 

[Unrest]

There's a formula for it at the top of this page:

http://en.wikipedia.org/wiki/Rotational_energy

 

[ANarwhal]

Thanks, and what would be a rough conversion of this energy into electrical energy?

 

[russ_watters]

Figure 90% conversion efficiency.