Can Alternating Current Generate Light?

  • Context: High School 
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Discussion Overview

The discussion explores the possibility of generating light through alternating current, focusing on the relationship between electromagnetic waves and electric currents. Participants consider theoretical implications and practical limitations, including the feasibility of such a process and the technology required to achieve it.

Discussion Character

  • Exploratory, Debate/contested, Conceptual clarification

Main Points Raised

  • Some participants propose that since light is an electromagnetic wave, alternating current could theoretically create fluctuations in electric and magnetic fields that produce light.
  • Others express skepticism about the feasibility of generating visible light from alternating current, questioning the practicality of using conventional wires and suggesting alternative methods involving manipulation of electrons in a vacuum.
  • One participant asserts that while it is theoretically possible to generate light from alternating current, current technology does not support this capability.
  • A later reply raises questions about the effects of higher frequencies on the resistance and inductance of metal transmitters, indicating a lack of knowledge in electronics but curiosity about the implications.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the feasibility of generating light from alternating current, with multiple competing views and uncertainties remaining in the discussion.

Contextual Notes

Limitations include the dependence on technological advancements and unresolved questions regarding the behavior of materials at higher frequencies.

lluke9
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Is this even possible? Since light is an electromagnetic wave, creating an alternating current will create fluctuations of electric and magnetic field and will... make light?

I highly doubt this is possible, but I thought it was worth asking to see why it CAN'T happen.
 
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lluke9 said:
Is this even possible? Since light is an electromagnetic wave, creating an alternating current will create fluctuations of electric and magnetic field and will... make light?

I highly doubt this is possible, but I thought it was worth asking to see why it CAN'T happen.
Visible light is in the range of 300 THz. So, if it is feasible for EHF, which is in the 300 GHz range, I bet it should also somehow be possible for light.

I don't think you would be able to use wires to conduct the current; I guess would have to be by manipulating electrons in the vacuum. Perhaps if you give them a high enough energy and submit them to a huge magnetic field, that will create electromagnetic waves that could reach visible range.
 
Last edited:
It's possible but we don't have the technology to do it.
 
Interesting. I'm wondering what the effect on the metal transmitter would be. Does higher frequency have different amounts of resistance or inductance or anything? (My knowledge of electronics is lacking to say the least)
 

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