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direction of forces acting on the coil. The change in direction of force pushes the coil; and it, moves another half turn. Thus, the coil completes one rotation around the axle. Continuation, of this process keeps the motor in rotation., , In commercial motor, electromagnet; instead of permanent magnet; and armature is used., Armature is a soft iron core with large number of conducting wire turns over it. Large, , number of turns of conducting wire enhances the magnetic field produced by armature., Coil rotates, , , , Metal or graphite, brush contact, , 16. Michael Faraday : Gave the law of Electro magnetic Induction : When a conductor is, set to move inside a magnetic field or a magnetic field is set to be changing around a, conductor, electric current is induced in the conductor., , 17. Galvanometer : It is an instrument that can detect the presence of a current in a circuit., If pointer is at zero (the centre of scale) then there will be no flow of current., , If the pointer deflect on either side right or left, this will show the direction of current., Represented by, , at, , NU,, ELECTRIC GENERATOR :, , The structure of electric generator is similar to that of an electric motor. In case of an electric, generator a rectangular armature is placed within the magnetic field of a permanent, magnet. The armature is attached to wire and is positioned in way that it can move around, an axle. When the armature moves within the magnetic field an electric current is induced., The direction of induced current changes, when the armature crosses the halfway mark of its