How do radio antennas convert electrical energy into photon energy?

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Discussion Overview

The discussion centers on the mechanism by which radio antennas convert electrical energy into photon energy, exploring the principles of electromagnetic wave generation and the role of voltage in this process. It includes theoretical explanations and questions regarding circuit completeness.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the process of converting electrical signals into photon energy.
  • Another participant explains that moving charged particles back and forth in an antenna generates electromagnetic waves, which carry energy away from the antenna.
  • Questions arise regarding the necessity of a complete circuit for applying voltage to the antenna.
  • A response clarifies that while a complete circuit is needed for current flow in equilibrium, voltage can be applied without a complete circuit, allowing for transient current flow.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of a complete circuit for voltage application, indicating that the discussion remains unresolved on this point.

Contextual Notes

Some assumptions about circuit behavior and the nature of voltage application are not fully explored, leaving room for further clarification.

MichaelsTech
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How do transmitters convert electrical signals into photon energy?
 
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Moving charged particles back and forth produces electromagnetic waves, just as you can produce waves in water by moving an object back and forth in the water.

A radio transmitter works by applying a changing voltage to the antenna, causing electrical charges in the antenna to move back and forth. These in turn create electromagnetic waves which travel outwards, carrying energy with them.
 
How can a voltage be applied if it is not a complete circuit?
 
MichaelsTech said:
How can a voltage be applied if it is not a complete circuit?

You need a complete circuit to get current to flow when your circuit is in equilibrium but you don't need a complete circuit to apply a voltage or to get current to flow for a very short time.

Google for "LC oscillator" for a simple example.
 

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