Question

(ii )Explain the given figure with following points
a) construction
b) working
c) Uses​

Answer 1

Answer:

Principle: Electric generator works on the principle of electromagnetic induction. It converts mechanical energy into electrical energy.

Construction: A loop ABCD is rotated in a permanent magnetic field. Its ends are connected with two semi-circular rings as shown in the figure below. These rings are insulated from each other and can slide while remaining in contact with brushes X and Y. A galvanometer is connected between the two ends of the brush.

Working: On rotating the loop in a magnetic field, the side AB moves upward and the side CD moves downwards. Thus magnetic flux linked with the loop changes and a current is induced in it whose direction can be determined by Flemings right hand rule.In the figure, the current is flowing through the path

B-A-G-D-C.

After half rotation, the ring P comes in contact with brush Y and the ring Q, comes in contact with brush X. Thus, the brush X is always in contact with the side moving upwards and brush Y is always in contact with side moving downwards as a result of which the current flows in one direction. This current is called direct current. This type of generator is called D.C. generator. Similarly, instead of a half ring, if a full ring is used then, A.C. current can be generated and such a generator is called an A.C. generator.