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[jimmyyami]

If I created some idea that's almost purely just a theory but it's quiet obviously useful and definitely will work under common sense.   For example,  what if I'm the first one in this world comes the idea to use wind power to generate electricty. Then.....
1)  Can I patent my idea with an equation simply like this   " Wind power + somekind_of_machine = Electricty " 
2)  Do I really need to build some machine for this idea to get patent?
3)  What's the best way for the inventor to do / or what should to do under this circumstance?  The theory is quiet obviously useful and definitely will work under common sense.
 
Thanks you
Danson   

[JimIvey]

Forget "common sense."  So many people use that term to mean "just trust me" that the term is almost meaningless in science, technology, and the law.

However, if you can describe your invention and how to make and use it such that one or ordinary skill in the relevant technology/ies can make and use your invention, you're golden.  You don't have to be able to make and use your own invention, only to describe it adequately that the average-skilled person in the relevant technologies can do so.

So, let's take your example of wind energy.  I presume you mean generation of electricity and not simply harnessing the power of the wind to do work.  The latter would require predating the first sail boat -- and I have no idea how far back that goes, but it at least pre-dates the industrial age and any modern patent system.

So, you describe a Danish windmill in which the giant grind stone is replaced with an electric generator, assuming both are known at the time.  Since one drives a shaft and the other requires a driven shaft, the coupling would seem straight forward.  However, my "common sense", intuitive feeling about the matter is irrelevant.  What matters is whether the average windmill engineer and average electric generator engineer could couple the two from my description. 

I hope that makes sense.

Regards.

[jimmyyami]

You have made the point very clear.
I'm very appreciate for your help, James.

Happy Thanksgiving everybody~~~~~