ELECTRIC GENERATOR FULL CONCEPT! FAST!!! BY A PERSON WITH GOOD RANK
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An electric generator as shown in fig consist of a rotating coil ABCD placed between the two poles face a permanent magnet. The two ends of this coil are connected to two rings R1 and R2 .The inner side of these rings are made insulated. The two conducting stationary brushes B1 and B2 are kept pressed separately on the rings R1 and R2 are internally attached to a axle. The Axle may be mechanically rotated temhe coil inside the magnetic field. outer ends of the brushes are connected to the galvanometer to show the flow of current in the given external circuit
when the axle is attached to the two rings is rotated such that the arm ab moves upwards and CD arm moves downwards in the magnetic field produced by the permanent magnet. let us say coil ABCD is rotated clockwise in the arrangement shown in fig. by applying Flemings right hand rule. the induced current are set up in the arms along the direction AB and CD .Thus an induced current flows in the direction ABCD. if there are larger number of coil the current generated in each turn adds up to give a large current through the coil
after half a rotation arm CD starts moving up and AB moving downward as a result the directions of the induced current in the direction DCBA the current in the external circuit now flows from B1 to B2 thus after every rotation the polarity of current in the respective arm changes. such current which changes direction after equal intervals of time is called alternative current generator
to get a direct current which does not change the direction with time a split ring type commutator must be used. with this arrangement one brush is at all times in contact with the arm moving up in the field while the other is at all times contact with the arm moving down we have seen the working of a split ring commutator in the case of an electric motor thus unidirectional current is produced this generator is called DC generator the difference between the two generator is
in DC generator current is unidirectional
in AC generator current reverse it's direction periodically.
when the axle is attached to the two rings is rotated such that the arm ab moves upwards and CD arm moves downwards in the magnetic field produced by the permanent magnet. let us say coil ABCD is rotated clockwise in the arrangement shown in fig. by applying Flemings right hand rule. the induced current are set up in the arms along the direction AB and CD .Thus an induced current flows in the direction ABCD. if there are larger number of coil the current generated in each turn adds up to give a large current through the coil
after half a rotation arm CD starts moving up and AB moving downward as a result the directions of the induced current in the direction DCBA the current in the external circuit now flows from B1 to B2 thus after every rotation the polarity of current in the respective arm changes. such current which changes direction after equal intervals of time is called alternative current generator
to get a direct current which does not change the direction with time a split ring type commutator must be used. with this arrangement one brush is at all times in contact with the arm moving up in the field while the other is at all times contact with the arm moving down we have seen the working of a split ring commutator in the case of an electric motor thus unidirectional current is produced this generator is called DC generator the difference between the two generator is
in DC generator current is unidirectional
in AC generator current reverse it's direction periodically.
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