Vacuum Tube Diode Explained: Electron Boiling

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Discussion Overview

The discussion focuses on the mechanism of vacuum diode operation, particularly the behavior of electrons that are emitted from the cathode, often referred to as 'boiling'. The scope includes theoretical explanations and conceptual clarifications regarding electron dynamics within the diode.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant asks for an explanation of how electrons behave when they are emitted from the cathode of a vacuum diode.
  • Another participant states that electrons leave the cathode at low thermal velocities and are subsequently accelerated towards the anode by the electric field present between the two electrodes.
  • A question is raised about the presence of space charges and why they do not flow towards the anode.
  • A later reply clarifies that while space charges do flow towards the anode, the continuous emission of electrons from the cathode maintains a steady current and a constant space charge.
  • One participant seeks clarification on the behavior of electrons before the steady current is established, indicating a focus on the initial conditions of the system.

Areas of Agreement / Disagreement

The discussion contains multiple viewpoints regarding the behavior of electrons and space charges in a vacuum diode. There is no consensus on the initial behavior of electrons before a steady current is established.

Contextual Notes

The discussion does not resolve the assumptions regarding the initial conditions of electron behavior or the dynamics of space charge in the vacuum diode.

pardesi
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Can anyone explain me the mechanism of vacuum diode.Specifically how the electronts which are 'boiled' of the cathode behave
 
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They leave the cathode at low, thermal velocities.
They are accelerated to the anode by the electric field between the anode and the cathode.
 
why are there any space charges at all why don'e they flow towards the anode
 
pardesi said:
why are there any space charges at all why don'e they flow towards the anode
The space charge does flow toward the anode, but more electrons keep coming from the cathode, so there is a steady current and a constant space charge.
 
well actually i was talking about the situation before the steady current begins then what does happen
 

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