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The first hot filament diode tube was invented in 1904 by Fleming, the first hot filament triode tube was invented in 1907 by DeForest. However it was not until 1913 that it was determined that high vacuum was actually needed for efficient and reliable operation of these tubes. So true hot filament vacuum tubes were not made and used until 1913.
What else can I help you with?
What did Joseph swan invent?
Joseph Swan invented the carbon filament because to see light back in the days. Which turned out to be a light bulb.
What was invented between 1918 and 2018?
Much of modern technology was invented in that time, including the Internet, most of the technology relevant for computers, vacuum tubes, transistors, spacecraft, etc., etc., etc....
Is resistance in the filament of a lamp essential or not?
Yes, the resistance of the filament of a light bulb is what generates enough heat to make the filament glow and produce light.
Will bulbs be easier to operate when the higher the input current?
Higher input current means higher voltage. A bulb contains one filament (tungsten) when input power supply passing through this filament, the filament gets hot and makes a red color and then yellow. This filament needs only electrons flow, but if we are operating higher current bulb efficiency will down, when the filament burns out.
Why ordinary bulb has short life?
Because an 'ordinary' bulb has a metal filament which glows through resisting the electricity flowing through it. This eventually weakens the filament and it breaks. The 'energy-saver' bulbs are basically miniature fluorescent tubes - these have electrodes at either end of the tube which generate electricity, this 'excites' the molecules of the fluorescent coating - producing light. They only fail when there's no more coating inside the tube - which means they last MUCH longer !
Who invented the bike tubes?
John Dunlop invented the pneumatic tubes.
Who invented the modern filament?
A Hungarian person
What did Thomas Alva Edsion invented?
Filament bulb
Who invented tubes?
scienctists
Who invented the carbon filament for the electric light?
James watt
Who invented the incandescent filament electric light bulb?
Thomas A. Edison
Did Lewis Howard Latimer light bulb with a carbon filament?
yes he improved the light bulb that Edison invented using the carbon filament.
Vacuum tubes used in power amplifiers the filament power supply is typically how many volts?
6.3
When were float tubes invented?
The float tube was invented in the 1950's by a fisherman. Float tubes were around for 30 years before they gained popularity in the 1980's.
When were the vacuum tubes invented?
1904, a diode by Fleming.
Who invented the tungsten filament lamps?
Thomas Edison It was actually Irving Langmuir (of General Electric), also an American. Edison's incandescent lamp used a carbon filament, as did that of his contemporary, England's Joseph Swan who got there before Edison (who invented a longer lasting carbon filament). William Coolidge improve on Langmuir's filament by making it longer (the familiar twisted shape) and brighter. Humphrey Davy had invented a platinum filament way back in 1809 that worked, but was too expensive for commercial use. Those that followed him failed to cotton on to the use of a metallic filament and went for carbon instead. What Tomas Edison can claim is the 'development' of a commercially useful light bulb using a carbon filament - though this was superseded by the tungsten filament not long after.
Who invented the vacuum tubes and storage devices?
Vacuum tube was invented by lee de forest .
