17-12-2012, 05:43 PM
WiTricity Technology : The Basics
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INTRODUCTION
In this era of modernization, electricity has become the unavoidable part
The major source of conventional form of electricity is through wires. The
continuous research and development has brought forward a major
breakthrough, which provides electricity without
wonder is called WiTricity.
There are certain small but very useful discoveries made in history, which
changed the world forever, Newton’s gravitational law, Watt’s steam engine,
Thomson’s bulb and many more. But a renaissance occurred with the
invention of Electromagnetic Waves by Maxwell. Sir Jagdish Chandra Bose
successfully generated electromagnetic waves having wavelength in
of 5mm to 25 mm. Thereafter an Italian scientist named Marconi succeeded in
transmitting electromagnetic waves up to a distance of several miles.
And with this there started a new era called
WIRELESS TECHNOLOGY. Today, as we can see the
word ‘wireless’ is common in day
Wireless communication has made the world smaller.
Almost each and everything is wireless or cordless.
Cordless mouse, cordless keyboard, satellite
communication, mobiles, cordless microphones and
headphones, wireless internet service i.e. WIFI, etc.
And these have definitely increased the standard of
living.
Ellectricity: The flow of electrons (current)
through a conductor (like a wire), or charges
through the atmosphere (like lightning). A
convenient way for energy to get from one place to
another!
Magnetism: A fundamental force of nature, which
causes certain types of materials to attract or repel
each other. Permanent magnets, like the ones on
your refrigerator and the earth’s magnetic field, are
examples of objects having constant magnetic fields.
Oscillating magnetic fields vary with time, and can
be generated by alternating current (AC) flowing on
a wire. The strength, direction, and extent of
magnetic fields are often represented and visualized
by drawings of the magnetic field lines.
Ellectromagnetism: A term for the
interdependence of time-varying electric and
magnetic fields. For example, it turns out that an
oscillating magnetic field produces an electric field
and an oscillating electric field produces a magnetic
field.
Magnetic Induction:
A loop or coil of conductive
material like copper, carrying an alternating current
(AC), is a very efficient structure for generating or
capturing a magnetic field.
If a conductive loop is connected to an AC power
source, it will generate an oscillating magnetic field
in the vicinity of the loop. A second conducting loop,
brought close enough to the first, may “capture”
some portion of that oscillating magnetic field,
which in turn, generates or induces an electric
current in the second coil. The current generated in
the second coil may be used to power devices. This
type of electrical power transfer from one loop or coil
to another is well known and referred to as magnetic
induction. Some common examples of devices based
on magnetic induction are electric transformers and
electric generators.
Resonance:
Resonance is a property that exists in many different physical
systems. It can be thought of as the natural frequency at which energy can
most efficiently be added to an oscillating system. A playground swing is an
example of an oscillating system involving potential energy and kinetic energy.
The child swings back and forth at a rate that is determined by the length of
the swing. The child can make the swing go higher if she properly coordinates
her arm and leg action with the motion of the swing. The swing is oscillating at
its resonant frequency and the simple movements of the child efficiently
transfer energy to the system. Another example of resonance is the way in
which a singer can shatter a wine glass by singing a single loud, clear note. In
this example, the wine glass is the resonant oscillating system. Sound waves
traveling through the air are captured by the glass, and the sound energy is
converted to mechanical vibrations of the glass itself. When the singer hits the
note that matches the resonant frequency of the glass, the glass absorbs
energy, begins vibrating, and can eventually even shatter. The resonant
frequency of the glass depends on the size, shape, thickness of the glass, and
how much wine is in it.