Archive
7th of September 2015
Physics
Q:

when split ring act as a commutator then why is it used in a dc generator ? how does it not alternate current in dc generator


how does the slip ring alternates current in ac generator?

Kanishka Panwar - CBSE - Class X

Monday, September 07, 2015 at 18:05:PM

A:

Hi Kanishka,
The function of split ring is to make the coil of the motor rotate in the same direction.
 
In an AC generator the coil itself rotates in opposite direction after every half rotation so that reverse current is obtained. If here a split ring is used then it will defeat the whole purpose of producing an AC current. It will start producing a DC current if split ring is used as the coil will rotate in reverse the split ring will make the direction of current reverse making it flow in the same direction giving rise to DC current.
 
So, a split ring or a commutator should not be used for AC generator. If you want a DC current then you can use it.

Monday, September 07, 2015 at 18:09:PM