Can the EM Spectrum Be Converted to Electricity Using Transformer Coils?

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Discussion Overview

The discussion centers around the feasibility of converting electromagnetic (EM) spectrum energy, from infrared to gamma radiation, into electricity using transformer coils or similar devices. Participants explore various methods of energy conversion and the limitations associated with different frequencies of the EM spectrum.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that the EM field of a magnet or electromagnet can be converted to electricity using a transformer, questioning if this applies to the entire EM spectrum.
  • Another participant argues that energy cannot be converted from the field of a magnet or electromagnet without depleting the field, emphasizing that energy is harvested from moving magnets instead.
  • A participant recalls an observation of a professor demonstrating EM fields using a Tesla coil and a fluorescent bulb, expressing uncertainty about the accuracy of this demonstration.
  • It is noted that the operation of a transformer involves alternating current generating an alternating field, which can light lamps, but does not directly address the broader question of EM spectrum conversion.
  • One participant introduces the concept of antennas, suggesting that a coil-shaped antenna could theoretically absorb EM energy, although this involves complex mathematics.
  • Another participant mentions that small antennas can efficiently absorb visible light, although they may not resemble traditional coils.
  • For direct interaction with EM radiation, such as with a radio antenna, it is suggested that the antenna would need to be on the scale of a few hundred nanometers, which complicates the energy conversion process due to photon energy differences compared to RF wire antennas.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility and methods of converting EM spectrum energy into electricity. There is no consensus on the effectiveness of transformer coils for this purpose, and various models and approaches are discussed without resolution.

Contextual Notes

Limitations include the dependence on specific setups for energy conversion, the scale of antennas required for different frequencies, and the unresolved mathematical complexities involved in theoretical descriptions.

rimmini
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The EM field of a magnet or electromagnet can be converted to electricity with the use of a transformer (coil). My question is... Does that hold up for the whole EM spectrum... IR through Gamma?
 
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You cannot convert "the field of a magnet/electromagnet to electricity" - in the way that afterwards the field would be gone.
You can harvest energy from moving magnets, slowing them down in the process. Simple setups will give you alternating current, where the frequency is proportional to the (rotational) velocity of your moving objects, with a prefactor given by the setup itself.
Rotations in useful setups are limited to ~10000 rotations per second, so you will not get any MHz-frequency from generators. And even that is far away from the frequency of infrared or even gamma radiation.
 
Ok, I thought that I once saw a prof use a tesla coil, and a flourecent bulb to show that em fields were all around. Maybe I was mistaken.
 
rimmini said:
Ok, I thought that I once saw a prof use a tesla coil, and a flourecent bulb to show that em fields were all around. Maybe I was mistaken.
That is similar to a transformator - you use alternating current to generate an alternating field, and this can be used to light lamps.
 
What rimmini seems to have been asking about is an antenna, or at least an antenna that takes the form of a coil. It takes some somewhat involved math to theoretically describe.

Small antennas have been made that are efficient at absorbing visible light, although they don't look exactly like coils.
 
Last edited:
For direct interaction, as with a radio antenna, the antenna would need to be a couple of hundred nanometers long - molecule sized. But the photon energy would make the situation different from what goes on in a wire antenna at RF.
 

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