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The electrical device that
converts Mechanical energy in to
Electrical energy is called AC
Generator. This is originally
designed by scientist Nikola
Tesla.
Its work on the basic
principle of
FARADAY’S LAW OF
ELECROMAGNETIC INDUCTION.
FARADAY’S LAW:-
It stated that an emf is inducedin a coil
,when it is rotated in a uniform magnetic
field.the emf induced in a conducting coil is
equal to the negative of rate of Change of
flux.it is written as.
ɛ= -NΔɸ/Δt
CONSTRUCTION OF AC GENERATOR:-
The main component of AC
generator are,
Armature
Magnets
Slip rings
Carbon brushes
Coil
Rotator
Armature:-
It is a rectangular coil consist of a large number of
turns of insulated copper wire.
Magnets:-
magnets of two poles(North and South pole) are use
to produce magnetic field.
Slip rings:-
The end of the armature is connected to two hollow
rings, which are called slip rings.
Carbon brushes:-
There are two carbon brushes ,they provide
contact With the slip rings.
The brushes are also use to pass the current
from the armature to the external power
line through the slip rings.
WORKING OF AC-GENERATOR:-
When ever there
is a change in the orientation of the coil,
magnetic flux will also change as a result it
induces emf In the coil. That is
ɛ=vBL sinɵ
Where
“v” is velocity.
“B” is magnetic field .
“L” is the length of coil.
The mathmatical equation for AC
Generator is
ɛ=ɛ°sinɵ
Where as,
ɵ=ὠt
So,
ɛ=ɛ°sinὠʈ
And
ɛ°=NὠAB
Where
 “ɛ” is the induced emf at any instant of
time
 “ɛ°” is the peak value of the induced emf
“N” is the the number of turns of the
armature coil.
“A” is the area of coil.
“B” is the intensity of the magnetic
field.
 “ὠ”is the angular frequency of rotation
of coil.
When the plane of the coil is parallel
or(the coil is at the angle 0 degree)to the field
the emf induced is zero.
When the plane of the coil is
perpendicular or(the coil is at an angle 90
degree) to the field the emf induced in the
coil is maximum in the positive direction.
When the plane of the coil is at the angle
180 degree to the field the emf induced in the
coil is again becomes zero.
When the plane of the coil is at the angle
270 degree to the field the emf induced in
the coil is maximum In a negative direction.
When the plane of the coil is at the angle
of 360 degree to the field the emf induced is
again becomes zero.
AC CURRENT DEPENDS ON:-
The amount of current depends
on:
the speed at which the
conductor experiences a changing
magnetic field
the number of coils that make
up the conductor, and
the position of the plane of the
conductor with respect to the
magnetic field.
AC GENERATOR,GENERATOR presentation

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AC GENERATOR,GENERATOR presentation

  • 1.
  • 2.
  • 3. The electrical device that converts Mechanical energy in to Electrical energy is called AC Generator. This is originally designed by scientist Nikola Tesla.
  • 4. Its work on the basic principle of FARADAY’S LAW OF ELECROMAGNETIC INDUCTION. FARADAY’S LAW:- It stated that an emf is inducedin a coil ,when it is rotated in a uniform magnetic field.the emf induced in a conducting coil is equal to the negative of rate of Change of flux.it is written as. ɛ= -NΔɸ/Δt
  • 5.
  • 6. CONSTRUCTION OF AC GENERATOR:- The main component of AC generator are, Armature Magnets Slip rings Carbon brushes Coil Rotator
  • 7. Armature:- It is a rectangular coil consist of a large number of turns of insulated copper wire. Magnets:- magnets of two poles(North and South pole) are use to produce magnetic field. Slip rings:- The end of the armature is connected to two hollow rings, which are called slip rings. Carbon brushes:- There are two carbon brushes ,they provide contact With the slip rings.
  • 8. The brushes are also use to pass the current from the armature to the external power line through the slip rings. WORKING OF AC-GENERATOR:- When ever there is a change in the orientation of the coil, magnetic flux will also change as a result it induces emf In the coil. That is ɛ=vBL sinɵ Where “v” is velocity. “B” is magnetic field . “L” is the length of coil.
  • 9. The mathmatical equation for AC Generator is ɛ=ɛ°sinɵ Where as, ɵ=ὠt So, ɛ=ɛ°sinὠʈ And ɛ°=NὠAB
  • 10. Where  “ɛ” is the induced emf at any instant of time  “ɛ°” is the peak value of the induced emf “N” is the the number of turns of the armature coil. “A” is the area of coil. “B” is the intensity of the magnetic field.  “ὠ”is the angular frequency of rotation of coil.
  • 11.
  • 12. When the plane of the coil is parallel or(the coil is at the angle 0 degree)to the field the emf induced is zero. When the plane of the coil is perpendicular or(the coil is at an angle 90 degree) to the field the emf induced in the coil is maximum in the positive direction. When the plane of the coil is at the angle 180 degree to the field the emf induced in the coil is again becomes zero. When the plane of the coil is at the angle 270 degree to the field the emf induced in the coil is maximum In a negative direction. When the plane of the coil is at the angle of 360 degree to the field the emf induced is again becomes zero.
  • 13. AC CURRENT DEPENDS ON:- The amount of current depends on: the speed at which the conductor experiences a changing magnetic field the number of coils that make up the conductor, and the position of the plane of the conductor with respect to the magnetic field.