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Describe brifly, with the help of a labelled diagram, the basic elements of an A.C. generator.State its underlying princilple.Show diarammatically how an alternating emf is generated by a loop of wire rotating in a magnetic field.Write the expression for the instantaneous value of the emf induced in the rotating loop. |
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Answer» Solution :Basic elements of an `A.C.` generator An `A.C` generator consists of a rotor shatt on which a coil is mounted.A magnetic field is created around an armature coil with the HELP of permanent magnets. The terminals of the coil are connected to two slip rings.Carbon brushes are attached to slip rings so as to make connection with an external circuit. Underlying principle of an `A.C.` generator The underlying principle responsible for the working of an `A.C.` generator is electromagnetic induction.According to this principle.if a conductor is placed in a varying magnetic field, then current is INDUCED in the conductor. Generation of an alternating `e.m.f.` by loop of wire ROTATING in a magnetic field Expression of the instantaneous VALUE of the induced `e.m.f.` in a rotating loop `epsilon=NBAomegasin omegat` Where `N`=NUMBER of turns in armature coil `B`=Magnetic field vector `A`=Area vector of the coil `omega`=Angular speed  
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