Question

Draw a labelled diagram of an electric generator.

Answer 1

Hint :In order to solve this question, we are going to see what an electric generator is and how it works. The diagram is drawn for a generator taking all the parts and labelling them and then, by telling the function of each of the parts of the generator and telling how the current is generated.

Complete Step By Step Answer:
An electric generator is a device that converts the mechanical energy into the electrical energy for use in an electric circuit. The sources of the mechanical energy for this are the wind turbines, water turbines, steam turbines, etc.
Electromagnetic generators generally fall into the two categories, dynamos and alternators.
The electric generator works on the principle of Faraday’s law of EM induction.
The magnetic flux of an electric generator is given by
 $ \phi = NBA\cos \omega t $
And the induced EMF is given by
 $ \phi = NBA\omega \sin \omega t $

Working: On rotating a 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 the current is induced in it whose direction can be determined by Fleming’s 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 the brush X. Thus, the brush X is always in contact with the side moving upwards and the brush Y is always in contact with the side moving downwards.

Note :
The diagram for the generator that has been drawn shows the current which flows in single direction and is known as Direct current, it has half ring which generates the DC current and is known as a DC generator. Now, if there is a full ring in the circuit, the whole AC current is generated and it is called an AC generator.