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Spring 2008 1
GENERATION OF CURRENT INTHE PRESENCE OFMAGNETIC FIELD
Done by:
Viswanatha Sa!a"S#$%&&%'()*
+aishee +aishan,a#$%&&%'-&*
M"Hai,a Na.a Sai#$%&&%''/*
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Spring 2008 2
INTRODUCTION
Generally we use current to produce magnetic fieldaround the current carrying conductor. Here we are
using the technique of generating the current with the
help of magnetic field.
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Spring 2008 3
E0e1to!a.netis!E0e1to!a.netis!
• Electricity and magnetism are different facets ofelectromagnetism
– a moving electric charge produces magnetic fields
– changing magnetic fields move electric charges
• This connection first elucidated by Faraday, Mawell
• Einstein saw electricity and magnetism as frame!
dependent facets of unified electromagnetic force
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Spring 2008 4
Magnetic fields from electricity
• " static distribution of charges produces an electricfield
• #harges in motion $an electrical current% produce a
magnetic field
– electric current is an eample of charges $electrons% inmotion
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Spring 2008 5
E0e1to!a.nets
• "rranging wire in a coil and running a current
through produces a magnetic field that loo&s a lotli&e a bar magnet
– called an electromagnet
– putting a real magnet inside, can shove the magnet
bac& and forth depending on current direction' calleda solenoid
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Spring 2008 6
INTRODUCTION TO THE PRO+ECT
(n our pro)ect we use a circular wood consisting of circularmagnets around four to five. " *# motor is used to rotatethe circular wood with the help of shaft. #opper coils areplaced at the base of the shaft, while rotating, an emf is
induced in the copper coils and the copper coils may beused to generate electricity with the help of generator or wecan simply see whether the current is generated or not by
connection +E*s to the copper coils and the +E*s willglow.+ess power consumption and more power output which
is more useful.
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Spring 2008 7
#M-ET/ 0E12(0E*
Magnets +E*$+ight emitting diode%
#opper #oil
0otating /haft *# -ower /upply
Multimeter
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Spring 2008 8
PRINCIPLE AND 2OR3ING
" magnetic field is the magnetic effect of electric currentand magnetic materials. The magnetic field at any givenpoint is specified by both a ditrection and a magnitude $orstrength% as such it is a vector field.
#opper coils are placed at the base of the shaft, while rotating,an emf is induced in the copper coils and the copper coilsmay be used to generate electricity with the help ofgenerator.
we can simply see whether the current is generated or not byconnection +E*s to the copper coils and the +E*s will glow.
+ess power consumption and more power output which ismore useful
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Spring 2008 9
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Spring 2008 10
In451e4 C5ent
• The net part of the story is that a changing
magnetic field produces an electric current in aloop surrounding the field
– called electromagnetic induction, or Faraday3s +aw
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Spring 2008 11
The E0e1to!a.neti1 Conne1tion
• " changing magnetic field produces an electric field, and a
changing electric field produces a magnetic field.
• Electric and Magnetic fields can produce forces on charges
• "n accelerating charge produces electromagnetic waves$radiation%
• 4oth electric and magnetic fields can transport energy
– Electric field energy used in electrical circuits, e.g., released
in lightning
– Magnetic field carries energy through transformer, foreample
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Spring 2008 12
2ses of Electromagnetic 5aves• #ommunication systems
– ne!way and two!way
• 0adar
• #oo&ing $with microwaves%
• Medical (maging $6 rays%• 7ight 8ision9 $infrared%
• "stronomy $radio, µwave, (0, visible, 28, gamma%
All that we experience through our eyes is conveyed by
electromagnetic radiation…
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Spring 2008 13
APPLICATIONS
:.motors
;.transformers
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