Can I make a wind turbine from an Electric motor? Does it matter what the watts or voltage of the motor is?

I’m looking up information on how to build a wind turbine for my home if you can point me in the direction of how to build the thing, what materials I need, and how i can hook up the wind turbine to my current electric grid. I would really appreciate it, thank you=]

How do I build a home made windmill that makes electricity ?

What are the some applications of trigonometry?

I know that trig is use mainly by surveyors, navigators, map makers,etc.
But how can a person like me, who is not a scientist nor professional mathematician to use trigonometry in everyday lives?Please give me some examples of problems where can I use it.(for example in home)
And please explain the solutions.
I just want to know because I found trigonometry to be hard if I didn’t know how to apply it.

Is it possible to put electricity back in the grid via a wall socket?

Can you, in theory, take an energy source ie batteries etc and plug them into a wall socket without doing any damage to your own home? Would this lower your electric bill? I know batteries would cost money and would not be worth it, but in theory, would it work? And if you had a fluctuating power source (pretend you somehow wired your alternator in your car into the wall) how could you stop it from putting too much electricity back and damaging something?