Using DC Power to Create Electron Flow in a Tungsten Filament Light Bulb

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SUMMARY

This discussion focuses on the feasibility of generating electron flow through a vacuum using a tungsten filament light bulb powered by direct current (DC). The participants explore the concept of using two separate power supplies: one to heat the tungsten filament and another to create a potential difference. The analogy to a heated filament in a cathode ray tube (CRT) is also mentioned, highlighting the similarities in electron emission mechanisms.

PREREQUISITES
  • Understanding of DC current and its properties
  • Knowledge of tungsten filament operation in light bulbs
  • Familiarity with vacuum physics and electron flow
  • Basic principles of cathode ray tubes (CRTs)
NEXT STEPS
  • Research the principles of thermionic emission in tungsten filaments
  • Explore the design and function of cathode ray tubes (CRTs)
  • Investigate the effects of potential difference on electron flow in a vacuum
  • Learn about the applications of DC power in electron beam technology
USEFUL FOR

Electronics enthusiasts, physics students, and engineers interested in vacuum technology and electron flow dynamics.

cragar
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If i have a light bulb , and it has a tungsten filament and when i turn it on its gets hot ,
If i hook a lead to the filament and then put the anode away from the filament can i get electrons to flow through the vacuum , assuming this is done with DC current. If we used 2 different power supplies one to heat it and the other to create a potential difference.
 
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cragar said:
If i have a light bulb , and it has a tungsten filament and when i turn it on its gets hot ,
If i hook a lead to the filament and then put the anode away from the filament can i get electrons to flow through the vacuum , assuming this is done with DC current. If we used 2 different power supplies one to heat it and the other to create a potential difference.

Do you mean like a heated filament in a CRT (TV picture tube)?
 
yes i do
 

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