rotor blades-capture wind's energy and convert it to rotational energy of shaft shaft-transfers rotational energy into generator nacelle-casing that holds gearbox (increases speed of shaft between rotor hub and generator),generator ,electronic control unit(monitors system, shuts down turbine in case of malfunction and controls yaw mechanism),yaw controller(moves rotor to align with direction of wind) and brakes(stop rotation of shaft in case of power overload or system failure).