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

AI Thread Summary
Using DC power to heat a tungsten filament in a light bulb can create electron flow through a vacuum if a potential difference is applied. By connecting one lead to the filament and placing an anode away, electrons can be emitted from the heated filament. This concept is similar to how a heated filament operates in a CRT television. The discussion explores the feasibility of using two separate power supplies: one for heating the filament and another for establishing the potential difference. This method could potentially facilitate electron flow in a vacuum environment.
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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