How does energy from wind produce electrical energy?

1 Answer
Trevor Ryan.
Nov 6, 2015

The wind for example causes a coil to rotate. The rotating coil is placed in a magnetic field.
By Faraday's Law of Electromagnetic induction, the emf induced across a coil is directly proportional to the rate of change of magnetic flux through the coil. #E_i=-N(dphi_B)/(dt)#.
So hence an emf (voltage) is induced across the moving coil.

The direction of the induced emf always opposes the inducing action (by Lenz's Law) and as a result the induced voltage waveform is ac in nature (usually sinusoidal (#V(t)=V_maxsin(omegat+phi#)

The energy conversion is kinetic energy of the wind into rotational kinetic energy of the coil into electrical potential energy due the induced emf.

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