Question

how does electricity generate by wind mill

Answer 1

the shaft of the windmill is connected to the shaft of the armature of a generator .when the fast moving wind rotates the blades of the windmill, its shaft rotates the armature inside the generator. the rotating armature produces electric current. thus kinetic energy of the wind is converted into electric energy.

Answer 2

Fast moving wind rotatoe the blades, which in turn rotates the armature.
the armature turns the generator which produces electricity.