Thomas Edison

Born in 1847, Thomas Edison was a famed American inventor. He is credited with the invention of the practical light bulb, as well as phonograph and motion picture camera.

6,897 Questions
Thomas Edison
Nikola Tesla

Why did Nikola Tesla leave Thomas Edison?

Edison was working on an direct current motor when Tesla began working for him. He couldn't make it work properly and he offered 50 thoundands dollars if he could fix the machine. That was a easy job for Tesla. Once he finished it, Edison took the offer back stating that it was a joke. Tesla took off inmediatly. The next thing Edison did, he took the patent for the direct current motor.

Thomas Edison
Thomas Paine

What was all the inventions Thomas Paine made?

he invented a single span iron bridge and tried but failed to make smokless candle wick

Isaac Newton
Thomas Edison
Marie Curie

Did Isacc Newton invent the light bulb?

No, Thomas invented the light bulb

Thomas Edison

Who is known as the black Thomas Edison?

Elijah Mcoy

Thomas Edison
Celebrity Births Deaths and Ages

How and when did Thomas Edison die?

He died of old age (natural causes) on October 21, 1931. He was 84 years old when he died.

Electrical Engineering
Thomas Edison
Nikola Tesla

What is a tap on a Tesla Coil and where should you wire it?

If you are working with a coil, you should have all parts of the coil and knowledge to work with them. In the related links box below, I posted a websited which has all this knowledge and another one about builduing the tesla coil.

Chevy S-10
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Thomas Edison

What drug is commonly smoked in a light bulb?

The most commonly known drug is known as POTACS or in a scientific term Magnesium Diflouroxide. The effects of this drug can induce hallucination, vomiting, constipation and is overall very harmful to your health. ITS TOTALLY AWESOME!

Thomas Edison
Nikola Tesla

Was Nikolai Tesla Better than Thomas Edison?

Thomas Edison was actually jealous of Nikolai Tesla because Tesla was smarter

Languages and Cultures
Thomas Edison

In what year was the phonograph invented?


Thomas Edison

Did Thomas Edison invent the light bulb by himself?


Thomas Edison
History of the United States
Lyrics and Sheet Music

Did Thomas Edison make macaroni cheese?

No. Yankee Doodle stuck a feather in his cap and "called it macaroni."

Home Electricity
Thomas Edison

Why a bulb gets fused?

A bulb gets fused when short circuit occurs or high voltage passes

Thomas Edison

Where does Isabella Blake Thomas live?


Thomas Edison

Who was Thomas Alva Edison?

Thomas Alva Edison (1847 - 1931) is considered by the American society to be one the most successful inventors in history. Edison profoundly influenced modern life through inventions such as the incandescent light bulb, the phonograph, and the motion picture camera. He also patented over 1,000 other items. During his lifetime, he acquired 1,093 patents, and marketed many of his inventions to the public.

Thomas Edison

Who are Thomas Edison's great-grandchildren?

13 grandchildren; 15 great-grandchildren; and one great-great-grandson

Home Electricity
Thomas Edison
Light Bulbs and Artificial Lighting

What are light bulb filaments made of?

Incandescent light bulbs have filaments which are made mainly from the element tungsten and/or alloys which include tungsten.


Tungsten is the metal element used for the filaments in incandescent light bulbs.

Experiments were made with different materials to use as the filament, including natural fibres, pure metals and alloys of different metals, to find the material which had the longest life whilst glowing brightly enough to give out visible light. The metal Tungsten was found to be the best, because of its high melting point (almost 3700 K) and good resistance to electrical current.

For more information see the answer to the Related Question shown below.
Carbonized cotton was originally tried, and had moderate success. However, the material that finally worked the best was a filament made of tungsten, which shone brighter and lasted much longer.
It is made up of Tungsten which have an melting point of 3380 degree Celsius.

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Sentence and Word Structure
Example Sentences
Thomas Edison

How do you make a phonograph?

The production of a modern disc phonograph record is quite different from a cylindrical phonograph. I'll try to give a basic outline of the electro-mechanical process as it was before digital recording was introduced. First, the musicians perform into microphones. Signals from the microphones are boosted using either high quality microphone amplifiers or step-up transformers, and then fed to a professional multi-track analogue tape recorder. I believe that most studios used 32 track Ampex decks. To preserve fidelity the tape speed on these tape recorder were very high. I believe that typically it was 32 inches per second. This high speed reduces noise and distortion, and increases frequency response and dynamic range of the recording. Once recorded, the multiple channels are mixed down to two channels for stereo, and these two tracks are laid down on a master stereo tape. The next step is to produce a master disc using a special cutting lathe. The cutting lathe operates something like a record player only in reverse. It has a rotating platter like a turntable where a blank master disk is placed and turned. Held above the rotating disk is a record cutting head with a special stylus that's used to cut a groove into the blank master disk. The master stereo tape is played, and the stereo signal from the tape player is fed to very powerful and accurate amplifiers. The high power signals from the amplifiers drive the stylus on the lathe's cutting head, causing it to vibrate in sympathy to the input stereo signal. The cutting head is lowered onto the outside of the rotating master disk, much like a phono cartridge on a regular record player. When the vibrating stylus contacts the surface of the master disk, it cuts a groove into the surface. While this happens, the entire cutting head moves tangentially across the rotating blank master from the outside of the disk to the inside much like a tonearm on a record player. Once the side is cut that side of the master disk is created. The process is repeated for the second side of the record using a new blank master. This master is used to create molds which are used to press the disks which are sold to people. The molds, or stampers, are like negatives of the master disks and the final vinyl product sold to people. Instead of grooves the stampers have raised ridges. The stampers press vinyl blanks. The raised ridges being pressed on the blanks create the grooves. Now you have the final product ready for playback on a record player. This is a description which I believe is basically correct, and if I've made any errors please let others know. From the following web site: The phonograph is made up of several parts. Firstly the horn is used to collect the sound. This can be made of cardboard, in the Rough Science version we used a large metal funnel. At the bottom of the horn we need to fix a diaphragm. The diaphragm needs to be made of a thin but stiff material that will be strong enough to hold the stylus but be able to vibrate to the sound. We found that we got very little vibration by fixing the diaphragm directly onto the horn. However, when we used a small tin can fixed to the horn it worked very well (the tin can acts as a 'sound box' and increases the efficiency of transfer of sound to vibration). The thin metal bottom of the can formed the diaphragm. In the middle of the diaphragm we pushed a drawing pin through to form the stylus. As a simple test when you talk into the horn you can easily feel the drawing pin vibrate. The recording cylinder we used was formed of two wooden circles mounted on a piece of studding (long thread). These were held apart and fixed in place by wooden blocks between them and the whole thing was then covered in many layers of wax till we had built up a wax cylinder. Two nuts were placed on the thread and these were held in place on two supports fixed to the wooden base of the phonograph. A handle was then placed at one end of the thread. When the handle was turned the cylinder rotated but because of the screw thread it also moved along. The wax cylinder now needs to be made as precise a shape as possible. This is done by holding a razor blade firmly onto one the side of the wax disc while turning it fast. When the handle is turned very fast the razor shaves off excess wax. You don't need to move the razor as the cylinder will move along on its own accord. If this is done a few times a wonderfully smooth and precision cylinder of wax can be produced. The horn-diaphragm-stylus unit then needs to be fixed onto the base but able to move so that the position of the drawing pin on the wax can be adjusted. This is best done using a hinge of some construction and another screw thread to make the final adjustment onto the wax.

Headlights Tail and Brake Lights
Dashboard Lights and Gauges
Thomas Edison

What could be wrong with the light behind the speedometer when it does not light up but the bulbs aren't burned out and the fuse is still good?

Is it possibly a short in the wiring? I think I'd start there.

Consumer Electronics
Thomas Edison
The Difference Between

What is a phonograph?

The phonograph was the first device for recording and replaying sound. It was invented and patented by Thomas Edison, a famous American inventor. The invention of the phonograph was the invention that made him famous. It uses a cylinder with tinfoil on it to record sound by indentations made by a pin. First thing recorded was "Mary had a Little Lamb".

Thomas Jefferson
Thomas Edison

Why did Thomas Jefferson invent a light bulb?

Thomas Jefferson didn't invent the light bulb. Thomas Edison made the light bulb practical for home use, but did not really invent it. See the related question.

Thomas Edison

What was the key factor in Thomas Edison's success in designing the light bulb?

Finding a metal that would glow without burning and evacuating the area to prevent burning out of the filament.

Electrical Engineering
Thomas Edison

Who invented the fluorescent light bulb?

The term "Fluorescent" dates back to approximately 1845-1852 where the English mathematician-physicist George Gabriel Stokes from Cambridge University named this "phenomenon" after fluorite, a strongly fluorescent mineral.
The invention of the fluorescent light is a string of discoveries and developments by many people in several countries. It was developed over 80 years since the invention of the working electric light bulb by Thomas Edison. Like so many things that we take for granted today, fluorescent lighting is the result of numerous small additions to the knowledge and technology of the time.

The development started with experiments in the 1840s by British scientists, George C. Stokes, Michael Faraday and James Clerk Maxwell. A German glass blower, Heinrich Geissler, continued with the experiments and in 1856 produced a vacuum tube that would produce a green glow when a current was passed through it. The tube had little practical value because the green light didn't provide useful illumination. However, Julius Plucker and Alexandre Bequerel experimented with the tube. Bequerel discovered that certain minerals glowed when they were in an operating tube and added coatings to the inside of the tube that would glow.

At the 1893 World's Fair, the World Columbian Exposition in Chicago, Illinois displayed Nikola Tesla's fluorescent lights.

In 1896, Thomas Edison put a calcium coating into the tube and generated useful light. The short life of the tube meant that it never went into production. Nicola Tesla contributed with variations of the tube, again without producing a commercial product. Daniel Moore continued Edison's work and 1904 saw his tubes being used commercially for some limited applications.

In 1894, D. McFarlane Moore created the Moore lamp, a commercial gas discharge lamp meant to compete with the incandescent light bulb of his former boss Thomas Edison. The gases used were nitrogen and carbon dioxide emitting respectively pink and white light, and had moderate success.

An American engineer, Peter Cooper Hewitt (1861-1921) developed the mercury vapor lamp at the same time. It produced yet another green light output so its practical application was limited.
Peter Cooper Hewitt patented (U.S. patent 889,692) the first mercury vapor lamp in 1901. The low pressure mercury arc lamp of Peter Cooper Hewitt is the very first prototype of today's modern fluorescent lights.

In France, George Claude made neon and argon tubes which glowed red and blue respectively. Although it was not of practical use for illlumination, the neon tubes employed electrodes that were longer lasting than others of the time. Fellow Frenchman Jacques Risler added a fluorescent coating to Claude's tubes and his product made it to commercial production.
In Germany, Friedrich Meyer, Hans-Joachim Spanner, and Edmund Germer all worked on low pressure vapor lamps. Although they achieved technical success, their lamp was never manufactured commerically.

General Electric had interests in the new lighting technology and had purchased several patents including Germer's. It came down to George E. Inman and his team of engineers at GE to turn the technology into a commercially viable product. There were a number of legal battles that were fought during the 1920s and 1930s to establish the rights to the technologies. Because of the number of people who contributed to the product, there were numerous patents that affected it. Commercial sales of fluorescent lamps by GE commenced in 1938.

It has been reported that Agapito Flores, a Philippino inventor, received a French patent for a fluorescent bulb and that the General Electric Company bought Flores' patent rights and manufactured and sold his fluorescent bulb (making millions from it). However, all the inventors named above and more predate Agapito Flores' possible work on any fluorescent bulb.

According to Dr. Benito Vergara of the Philippine Science Heritage Center, "As far as I could learn, a certain Flores presented the idea of fluorescent light to Manuel Quezon when he became president. At that time, General Electric Co. had already presented the fluorescent light to the public."

There are other names that do not get mentioned in this brief answer. Each person made their own important contribution and although they are not mentioned, credit should be given to each person who experimented, played, observed and developed the science and technology surrounding the development. Although the early part of the 20th century saw large companies funding and sponsoring inventors and developers, there were many who carried out work without other funding. Perhaps it is the independent experimenters who deserve special recognition for their work.

See the related links below for more information about the history of the fluorescent lamp.
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Thomas Edison

Are any of Thomas Edison's children alive?

no their all dead

Thomas Edison

What did Thomas Edison do?

He was an inventor, he invented the lightbulb and the phonograph. He made more than 100 inventions.

Thomas Edison

Who stole Thomas Edison's device in poptropica?

The French reporter did.


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