how to produce 5 volts energy from a cpu fan

[Aakash1]

I want to use the CPU fans to produce minimum 5 volts of energy using same polar magnets. is it possible?

 

[ThatVietGuy]

No.

 

[Someone Somewhere]

No, that's a fake way of trolling people.

The second law of thermodynamics is currently believed to be unbreakable.

 

[Ijack]

Fans and generators are just the same thing used in different ways. So, sure, you can use a fan as a generator (though it will produce AC current). How much power you get out of it depends upon the wind strength used to drive it.

Here's a link to get you started: http/www.instructables.com/id/Old-PC-Fan-Wind-Turbine-in-10-Minutes/