Answer:
The
working of an AC generator is as follows
As the coil rotates, the two rings also rotate with the
coil. The brushes P and Q keep contact with the rotating ring. When the coil
starts rotating with arm AB moving up and CD moving down (clockwise) cutting
the magnetic lines. According to Fleming's right-hand rule, the current is
induced in these arms in the direction ABCD.
After half rotation, arm CD moves down and AB moves up. As
a result, the direction of current in each segment changes, giving rise to net
induced current in the direction DCB.4.
Thus, after every rotation, polarity of current in the
respective arm changes, thereby generating an alternating current.
To convert an AC generator into a DC generator, a split
ring commutator is used. This helps in producing direct current.
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