The only difference between construction of D.C. generator and an A.C generator is that of:
Correct answer: A. Commutator
- A. Commutator
- B. Coil
- C. Carbon brushes
- D. Magnetic field
Explanation
In a DC (direct current) generator, the commutator is a crucial component. It consists of a segmented ring connected to the ends of the armature coil. Its purpose is to convert the alternating current induced in the armature coils into direct current. This is achieved by reversing the direction of current flow in the external circuit at the appropriate times, ensuring that the output current remains unidirectional.
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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