Getting power from spinning a rod

[Shinok87]

Sorry if this is a poorly worded question. I have something that can spin a rod and I need that rod to be connected to something that can produce power.

 

1. what can I use to produce the power?

 

2. where can I get what I need to produce the power?

 

Thank you.

[swansont]

A generator is an obvious answer. Many motors can be run in reverse to act as generators.

[Shinok87]

I am looking for something that can fit in an area of about 6"x6"x6". any idea where I can find a generator that size?

[CaptainPanic]

I am looking for something that can fit in an area of about 6"x6"x6". any idea where I can find a generator that size?

 

Any old dynamo from a bike will fit.