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  • Describe the working of an AC generator with the help of a labelled circuit diagram. What changes must be made in the arrangement to convert it to a DC generator

Describe the working of an AC generator with the help of a labelled circuit diagram. What changes must be made in the arrangement to convert it to a DC generator?

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Ans.
AC generator works on the principle of electromagnetic induction.
With the help of a motor, armature is rotated between two fixed permanent magnetic poles.
As the armature experiences the changing magnetic field due to its rotation, an electromotive force is generated.
The polarity of this electromotive force changes periodically depending on the angular speed of armature.
In this way the generator creates an alternating current source.
Therefore we can say AC generator is a device which converts mechanical energy into electrical energy.
If we want to use this AC generator as the DC source we have to use half split rings.
This split ring commutator changes the direction of current in half period, thus output current will have same direction
all the time

 

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