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PHYSICS
2016
WIRELESS
ELECTRIC POWER
TRANSMISSION
MAGNETIC INDUCTION
WIRELESS TRANSMISSION OF CURRENT IS BASED
ON THE ELECTRO MAGNETIC INDUCTION.
CONTENTS:
FARADY’S LAW
WORKING PRINCIPLE
DEMONSTRATION
SCHEMATIC DIAGRAM
FUNCTION
CIRCUIT DIAGRAM
USES IN EVERYDAY LIFE
A.B.NITIN NIKAMANTH
INTRODUCTION

Nikola Tesla was the first person to work on this concept.

This is based on the Faradays law of electromagnetic induction.

The faraday’s law states that when a coil of wire cut a magnetic field or when the
magnetic field cuts the coil of wire, current is induced in the wire.
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WIRELESS POWER TRANSMISSION
WORKING PRINCIPLE
In the case of a D.C current the magnetic
without
any
physical
contact
field created is constant and so the
connecting each other with wires.
or
magnetic field should be interrupted as
to make a difference in potential in the
coil.
Whereas in A.C current the magnetic
field generated is varying and this
varying magnetic field creates an e.m.f
in the coil without any movement in the
coil.
Hence A.C current can be used for the
transmission of the current.
With A.C, a magnetic field is generated
and is used to transmit electricity
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WIRELESS POWER TRANSMISSION
DEMOSTRATION
COMPONENTS
 Resistor ()
 Capacitor
 Transistor
 L.E.D
 Copper Coil
 Connecting wire
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WIRELESS POWER TRANSMISSION
SCHEMATIC DIAGRAM
The D.C current is first converted to
A.C current.
The A.C current is a varying current
which changes its polarities.
The converted current is then passed
through a coil (primary coil) of wire
to create a varying magnetic field.
But it will not make any difference as
the L.E.D blinks so fast that we
would not be able to identify the
difference and we may get a constant
glow.
So when a coil of copper wire is
brought on the track of this magnetic
field the copper coil (secondary coil)
gains a potential difference.
And finally the A.C current is used in
the circuit to light up an L.E.D.
Where as in the case a D.C current
the current flowing is constant and
the bulb or an L.E.D will glow
constantly.
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WIRELESS POWER TRANSMISSION
MAGNETIC LINES OF FORCE
B=
µi
[Sinθ1 + Sinθ2]
4πR
µ-permeability of free space
IN A CIRCLE
µi θ
B= [ ]
R 4π
=
µi 2π
[ ]
R 4π
µ𝑖
=
2𝑅
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WIRELESS POWER TRANSMISSION
In the case of a straight wire the direction
of magnetic lines of force can be found out
by placing the thumb of right hand along
the direction of current. The direction of
magnetic lines is along the direction of our
other fingers.
But in the case of a coil of wire it contains
n-loops.
In the case of a loop it contains minute
straight lines.
So the resultant direction is different in the
case of a loop.
The direction of magnetic lines of force in
the case of a loop can be determined by
placing all the fingers except the thumb
along the direction of current and the
WIRELESSto
POWER
thumb must be kept perpendicular
the TRANSMISSION
7
CIRCUIT DIAGRAM:
USES OF ELECTRIC INDUCTION

Generating power by placing satellites with giant solar arrays in Geosynchronous
Earth Orbit and transmitting the power as microwaves to the earth known as Solar
Power Satellites (SPS) is the largest application of WPT. Another application of WPT
is moving targets such as fuel free airplanes, fuel free electric vehicles, moving robots
and fuel free rockets. The other applications of WPT are Ubiquitous Power Source
(or) Wireless Power Source, Wireless sensors and RF Power Adaptive Rectifying
Circuits (PARC).
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WIRELESS POWER TRANSMISSION

This technology is being used in charging mobile phones.

This can be used in connecting networks which are situated in places that are
impossible to connect to.
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WIRELESS POWER TRANSMISSION