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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
What else can I help you with?
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.
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 clean my system unit?
with the help of vaccume cleaner and Brush.
How do you vacuum on little alchemy?
i think that is smoke+metal=vaccume
Mechanical device used for cleaning carpet?
Vaccume Cleaner
Dead fish in vaccume clogged plunger not working?
This happened to my hamster once
Why do you hear escaping air when you apply your brakes?
The power brake booster is leaking vaccume.
1993 dodge shadow es 2 point 5 runs rich and rough replaced oh two sensor plugs dist cap also cleaned out cat converter Still runs rich rough What next?
Need to check the map senser first and be sure the vaccume hose that hooks to it is not leaking vaccume. Then with engine running unplug the hose from senser and make sure there is vaccume on the hose. You should also check the fuel pressure regerlator by removing the vaccume hose that hooks to it while the engine is running, the engine should speed up if not then replace fuel reg.
