Your Questions About Wind Turbine Generators For Home

What are the basic element in wind energy conversion device?

I have to build a wind energy conversion device for my design subject. However, I can’t use toothed gears, gearboxes, energy storage systems (e.g. flywheels, batteries, pressurised fluids, etc), rolling
element bearings and existing (pre-made) fan impellers.

So I need rough ideas on what are the things that can replace those items which can make the device moving.

how many wind turbines to power the US?

im doing a project for school and i am trying to figure out the most efficient but least expensive way to power the US on alternative energy. Please i need to know the cost and how many wind turbines it would take!