[[Image:nacell.png |center|400px|thumb|Fig 10 [http://windturbinesforthehome.com/ Internal nacelle structure]]]
[http://windturbinesforthehome.com/ source]
'''Hub'''
[[Image:rotorhub.jpg |center|thumb|Fig 11 [http://syigroup.en.made-in-china.com/product/dbTQyzJOHYRi/China-Iron-Casting-Wind-Mill-Tower-Rotor-Hub.html Rotor hub]]]
[http://www.awewind.com/Products/TurbineConstruction/MainAssembly/RotorHub/tabid/81/Default.aspx source]
'''Drive shaft'''
[[Image:mainshaft.jpg|center|200px||thumb|Fig 12 [http://jiangyinzkforging.en.made-in-china.com/product/hewxIQjbgTpr/China-Wind-Turbine-Shaft-For-Wind-Power-Generator-ALIM2143-.html Shaft system]]]
[http://jiangyinzkforging.en.made-in-china.com/product/hewxIQjbgTpr/China-Wind-Turbine-Shaft-For-Wind-Power-Generator-ALIM2143-.html source]
'''Gear box'''
[[Image:Gearra.jpg |center|250px|thumb|Fig13 [http://machinedesign.com/article/green-technology-inside-an-advanced-wind-turbine-0605 Gear box]]]
[http://www.gears-gearbox.com/wind-turbines.html source]
'''Generator'''
The output rotational mechanical energy of the gear box is connected to the generator through generator shaft. It works on the principle of 'Faraday's law of electromagnetic induction". It converts mechanical energy into electrical energy.
Sources:[http://windturbinesforthehome.com/ Wind Power Turbines], [http://www.awewind.com/Products/TurbineConstruction/MainAssembly/RotorHub/tabid/81/Default.aspx Rotor Hub Assembly],[http://www.gears-gearbox.com/wind-turbines.html Gearbox for Wind Turbines], [http://www.top-alternative-energy-sources.com/inside-a-wind-turbine.html A Wind Turbine],[http://guidedtour.windpower.org/en/tour/wtrb/yaw.htm The Wind Turbine Yaw Mechanism]
===Anemometers===