Post on 21-Jun-2015
description
ELECTRIC GENERATORMechanical Electrical Energy Energy
G
INVENTOR OF GENERATOR
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.
Electric generator is based on the
phenomenon of electro magnetic induction.
It is based on the principle of Fleming's
right hand rule.
PARTS OF GENERATOR
It consist of:
1. Permanent magnets 2.
Galvanometer
3. Rotating rectangular coil 4. Rings
5. Brushes 6. Axle
WORKING OF ELECTRIC GENERATOR
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.
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.
AC CURRENT
The current which can change its direction is
called AC Current
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.
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.
DC CURRENT
The current which flows in only one direction and is
an unidirectional current called direct current
(DC).
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.
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.
MADE BY :
KRISHNA U. HIWALE
YAHAYA K. KHAN
RUSHIKESH G. RATHOD
VAIBHAV A. KULKARNI
GUIDED BY
*****NEETHI
MAM*****
*PHYSICS*