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Generation of electricity
from a wind turbine
Bradley Gaskell
Faraday’s Law
 Faraday's law of induction says that when
a magnetic field changes, it causes a voltage
 The experiment:
 Faraday takes a magnet and a coil and connects a
galvanometer (A device used for detecting and
measuring electrical current) across the coil. At
starting, the magnet is at rest, so there is no
deflection in the galvanometer i.e. needle of
galvanometer is at the center or zero position
 When the magnet is moved towards the coil, the
needle of galvanometer deflects in one direction
Faraday’s Law (Continued)
 When the magnet is held stationary at that position, the
needle of galvanometer returns back to zero position
 Now when the magnet is moved away from the coil, there is
some deflection in the needle but in opposite direction and
again when the magnet becomes stationary the needle of the
galvanometer returns back to the zero position
 Similarly, if magnet is held stationary and the coil is moved
away and towards the magnet, the galvanometer shows
deflection in similar manner. It is also seen that, the faster the
change in the magnetic field, the greater will be the induced
emf or voltage in the coil.
Faraday’s Equation
 Key:
 Triangle = Delta
 E = Induced Voltage/EMF
 N = Number of Turns
Wind turbines
A wind turbine is a device that converts the
wind's kinetic energy into electrical power
Wind turbines have blades which rotate via
the wind, this rotation changes the kinetic
energy into an electrical output
How Faraday’s Law and Wind
Turbines are Related
 The main principle of a wind turbine electric generator is: The
kinetic energy of the wind makes the blades of a wind
turbine to rotate. When the wind turbine rotates armature of a
electric generator which will produce the electricity according
to Faraday's law of electromagnetic induction.