AC Generator
AC Generator
An electric generator is used to convert mechanical energy to electrical energy.
Principle: It is based on the principle of electromagnetic induction. It is used to produce electric current by varying magnetic field through a coil.
Parts of Electric Generator: The difference parts of electric generator are explained as below:
1. Armature It is a coil having large number of turns of insulated copper wire wound over a soft iron core.
2. Field Magnet: It is a powerful magnet that provides a uniform magnetic field perpendicular to the axis of rotation of coil between the North and South poles.
3.Slip rings: In an AC generator, we use slip rings that is full rings with which the ends of coil are in contact. DC generator uses split ring type commutator-half rings with which the ends of the armature coil are in contact.
4. Brushes There are two stationary metallic carbon brushes which are in contact with external device and rings.
Types of Electric Generator: Electric generators are of two types:
1. Alternating Current generator (AC generator)
2. Direct Current generator (DC generator)
AC Generator:
It generates the current which changes its direction after equal intervals of time, i.e. alternating current.
Construction: An AC generator consists of a rectangular armature coil (ABCD) placed in a region of strong magnetic field (between the two poles of a permanent magnet). It experiences a torque due to the forces acting on it and produces a current. The two slip rings P and Q maintain contact of the coil with the load resistor through brushes X and Y without resistor being moved.
Working: As the coil rotates, two rings attached with it also rotate . The brushes X and Y keep the contact with the rotating ring P and Q when the coil starts rotating with arm AB moving downwards and CD moving upwards (anti-clockwise) cutting the magnetic lines.
According to Fleming's right hand rule, current is induced in these arms in the direction ABCD. After half rotation, arc CD moves downwards and AB moves upwards. As a result, the direction of current in each segment changes giving rise to net induced current in the direction DCBA. Thus, after every half rotation, polarity of current in the respective arm changes thereby generating an alternating current.
Magnitude of induced emf in a generator can be increased by
1. Increasing the number of turns of armature.
2. Increasing the area of the armature.
3. Increasing the speed of rotation of the armature.
4. Increasing the strength of the magnetic field.
When a coil rotated in magnetic field the induced current in it ____________________
| |||
| Right Option : A | |||
| View Explanation | |||
The Electromotive Force (EMF) developed by the generator depends upon ____________________
| |||
| Right Option : D | |||
| View Explanation | |||
If the coil is placed perpendicular to field lines then the number of lines passing through the coil is ________________ | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [10]
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
