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Biology; Chemistry; Physics: Post your doubts here!

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Could anyone explain to me the purpose of the split ring commutator in a DC motor. I was finding it really difficult to understand.....
 
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Can Anybody tell me the role of commutators in d.c motor and a.c generator?.....How it helps to let the coil move continuosuly?....I am very confused!!!..:/
in a d.c motor, electricity is USED to produce MOTION/CURRENT is used to produce MOTION, when the coil rotates, there has to be something to actually help the coil rotate, which is why there is a split ring commutator
in an a.c motor, MOTION is used to produce CURRENT/ELECTRICITY, using the Fleming's left hand rule, u will notice that on one part of the coil, the force is going down/up (this depends on the direction of magnetic field, and direction of current), and on the other one, it is going up/down. hence the coil rotated automatically, and we don't need a split ring commutator.

here u go

A.C motor.png
 
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