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# Electric generator

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### Electric generator

1. 1. ELECTRIC GENERATOR Mechanical Energy G Electrical Energy
2. 2. INVENTOR OF GENERATOR
3. 3. WHAT IS ELECTRIC GENERATOR? An Electric generator is an device in which mechanical energy is used to rotate a conductor in an area of magnetic field to generate electricity.
4. 4.  Electric generator is based on the phenomenon of electro magnetic induction.  It is based on the principle of Fleming's right hand rule.
5. 5. PARTS OF GENERATOR It consist of: 1. Permanent magnets 2. Galvanometer 3. Rotating rectangular coil 4. Rings 5. Brushes 6. Axle
6. 6. WORKING OF ELECTRIC G E N E R AT O R  When the axle attach to the rings is rotated such that one arm moves up and other moves down in the magnetic field produced by permanent magnet.  By applying Fleming right hand rule the induced currents are set up in this arms along there direction.
7. 7.  Thus an induced current flows through the direction of the ABCD .  After half a rotation, arm CD starts moving up and AB moving down.  As a result, the directions of the induced currents in both arms change, giving rise to net induced current.
8. 8. AC CURRENT  The current which can change its direction is called AC Current
9. 9. DO YOU KNOW  Electricity supplied to our homes, school buildings, company buildings etc. is AC, which reverses its direction after every second with a frequency of 50 Hz  Most power stations in the world generate AC than DC. This is because AC can be transmitted over very long distances without much loss of energy.
10. 10. AC GENERATOR After each half-rotation, the direction of the induced current is reversed. An AC reverses its direction after equal time intervals. A machine with this arrangement is called an AC generator.
11. 11. DC CURRENT The current which flows in only one direction and is an unidirectional current called direct current (DC).
12. 12. DO YOU KNOW :  Direct current may be obtained from an alternating current supply by use of a current-switching arrangement called a rectifier, which contains electronic elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction.
13. 13. DC GENERATOR Moving first in one direction, then in the other. Each end of the coil is attached to a separate metal slip ring that rotates with the coil. Brushes that rest on the slip rings are attached to the external circuit. Thus the current flows from the coil to the slip rings, then through the brushes to the external circuit. A machine with such an arrangement is called a DC generator.
14. 14. MADE BY : KRISHNA U. HIWALE YAHAYA K. KHAN RUSHIKESH G. RATHOD VAIBHAV A. KULKARNI
15. 15. GUIDED BY *****NEETHI MAM***** *PHYSICS*