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A vacuum tube is an instrument used to control the flow of electrons. The simplest form of this is called the triode and has three elements. An anode, a cathode, and a grid. The flow of electrons is always from anode to cathode the grid can influence the flow of the electrons. Like the light bulb the tube needs to be a vacuum or filled with gas to prevent the metals they are made of from catching on fire and melting.
The first person to discover that a grid could have an electric charge was Lee De Forest.
See also:
Lee De Forest
Edwin Armstrong
David Sarnoff
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoA vacuum tube is a current amplifier. It is manufacture with a heater to heat a cathode to emit electrons to a more positive plate or potential. the electrons flow is controlled by a negative potential [the grid] so electrons can be controlled to reach the plate.
Wiki User
∙ 14y agoIt's Vacuum Tube by-the-way. There were small bulb like electronic parts that were used in early computers. We don't use them anymore. Here you will find enough information about it http://en.wikipedia.org/wiki/Vacuum_tube
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What is Working principle of venturi tube?
Venturi tube is used to for flow measurement. It work on the principle of Bernoulli Equation.
When did Cathode ray tube amusement device happen?
Cathode ray tube amusement device happened in 1947.
How do you fix a broken tube light have done the usual - on off button got new tube light banged slapped cursed the framing moved the wires - nothing any ideas what could be wrong?
If you refer to a flurecent tube you need to check the starter if it has one (small round tube in the side of the light), check the fuse box for that light, check the switch for that light and check that the tube youve banged about has not also blown i.e. check in another tube socket if possible
Can you measure a vacuum tube using ohmmeter?
Maybe, but not sure info would be useful. You can use ohmmeter to check that a tube's filament is intact. Broken/burned-out filament is most likely reason for dead tube.
Why did Crookes cathode ray tube glow green?
The electrons emitted from cathode hit the glass of the tube, causing it to fluoresce.
What is a vaccume tube?
It's an electronic component, a predecessor to the transistor. It looks a little like a lightbulb, but with more wires in the capsule.
Why is outterspace a vaccume?
because theres no gravity
What is 3.08x10 to the 6?
speed of light in a vaccume
Why does a 1995 s10 blazer shut off when brakes are pressed?
Is your brake pedal hard ? If so replace the power brake booster. It sounds like you have a major vaccume leak in the booster when you apply the brakes. Power brakes work off of engine vaccume. If the dieafram is leaking vaccume when you apply the brakes it leans the engine out. ( creates a major vaccume leak ) and engine dies. Hope this helps.
Do'es the 1995 silverado 5.7 have vaccume advance?
No it does not.
What is a vacuum advance mechanism?
what is vaccume advance mechnism
Why does the air conditioner in a 1993 Grand Prix blow at the top and bottom but not at the vents on the dash?
Probably because U have a VACCUME Leak @ the In take Manifold where the Vaccume hose connects That goes 2 the vaccume modulator.butt sometimes it's just a collapsed vaccume hose. Usally it's ok @ an idle butt goes 2 the Windshield when U accelerate.L00k @ the actuater door hoses under the dash if all else is OK.-----Marv
How do you vacuum on little alchemy?
i think that is smoke+metal=vaccume
How do you clean my system unit?
with the help of vaccume cleaner and Brush.
Mechanical device used for cleaning carpet?
Vaccume Cleaner
Dead fish in vaccume clogged plunger not working?
This happened to my hamster once
Why vaccume is given during loss on drying?
Becouse in some of the substance cantain high boiling point solvent, which is not dry easily ,but when we applied vaccume during the drying in oven which decrese the boiling point and increase the rate of evaporation.
