Imagine a
future in which wireless power transfer is feasible: cell phones, household
robots, mp3 players, laptop computers and other portable electronics capable of
charging themselves without ever being plugged in, freeing us from that final,
ubiquitous power wire. Some of these devices might not even need their bulky
batteries to operate.
Firstly we will see issues in wired transmission
..Issues of Concern in the Power Generation Sector
Inability to
meet targets for capacity addition are due to problem areas like:
• Unavailability of fuel / lack of coal linkages for new projects,
• Land acquisition issues,
• Delays in environmental and other clearances, etc.,
• Inadequate domestic manufacturing capacity for balance of plant (BOP),
• Shortage of erection commissioning agencies / skills,
• Poor availability of construction equipment / machinery,
• Non-standardisation of layouts and design parameters for power plants,
• Shortage of domestic supply of skilled manpower,
• Poor logistics infrastructure.
• Unavailability of fuel / lack of coal linkages for new projects,
• Land acquisition issues,
• Delays in environmental and other clearances, etc.,
• Inadequate domestic manufacturing capacity for balance of plant (BOP),
• Shortage of erection commissioning agencies / skills,
• Poor availability of construction equipment / machinery,
• Non-standardisation of layouts and design parameters for power plants,
• Shortage of domestic supply of skilled manpower,
• Poor logistics infrastructure.
What I taught
...Late-night beeps
The story starts one late night a few months
ago with me sitting in the train , staring
at my cell phone on the . "It was probably the sixth time that month that
I was awakened by my cell phone beeping
to let me know that I had forgotten to charge it. It occurred to me that it
would be so great if the thing took care of its own charging." To make
this possible, one would have to have a way to transmit power wirelessly, so I started
thinking about which physical phenomena could help make this wish a reality.
Ways of wireless power power transmission methods
1.Radiation methods
One can envision using directed electromagnetic radiation, such as lasers, but
this is not very practical and can even be dangerous. It requires an
uninterrupted line of sight between the source and the device, as well as a
sophisticated tracking mechanism when the device is mobile.
2.Magnetically coupled resonance
One can envision using directed electromagnetic radiation, such as lasers, but
this is not very practical and can even be dangerous. It requires an
uninterrupted line of sight between the source and the device, as well as a
sophisticated tracking mechanism when the device is mobile.
In contrast, WiTricity is based on using
coupled resonant objects. Two resonant objects of the same resonant frequency
tend to exchange energy efficiently, while interacting weakly with extraneous
off-resonant objects. A child on a swing is a good example of this. A swing is
a type of mechanical resonance, so only when the child pumps her legs at the
natural frequency of the swing is she able to impart substantial energy.
One can envision using directed electromagnetic radiation, such as lasers, but
this is not very practical and can even be dangerous. It requires an
uninterrupted line of sight between the source and the device, as well as a
sophisticated tracking mechanism when the device is mobile.
Another example involves acoustic resonances:
Imagine a room with 100 identical wine glasses, each filled with wine up to a
different level, so they all have different resonant frequencies. If an opera
singer sings a sufficiently loud single note inside the room, a glass of the
corresponding frequency might accumulate sufficient energy to even explode,
while not influencing the other glasses. In any system of coupled resonators
there often exists a so-called "strongly coupled" regime of
operation. If one ensures to operate in that regime in a given system, the
energy transfer can be very efficient.
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