18 10, he invented the electric candle, which was illuminated by an arc between two carbon rods. This is the earliest form of electric light.
1Feb 1878, joseph swan made a vacuum bulb powered by carbon wires. 1880, patented in Britain. 188 1 year, his incandescent light bulb was officially listed.
1879 10, Edison finally succeeded in manufacturing an incandescent bulb with carbon fiber filament, which is called "carbon cotton filament incandescent lamp".
During this period, he constantly improved his technology, and finally decided to use tungsten wire as the filament, which is called "tungsten lamp" and has been used for a long time. Edison has also become a recognized inventor of electric light.
180 1 year, humphry davy, a British chemist, used platinum wire to electrify and glow in the laboratory.
18 10, he invented the "electric candle" which was illuminated by the arc between two charged carbon rods, which was the earliest prototype of the electric lamp.
1878 65438 In February, joseph swan made a luminous vacuum bulb with electrified carbon wires. 1880, he applied for a patent in Britain, 188 1 year, and the incandescent light bulb he invented was officially listed.
1879 10, Edison finally succeeded in making an incandescent bulb with carbon fiber as the filament, which is called "carbon cotton filament incandescent lamp".
During this period, he constantly improved his technology, and finally decided to use tungsten wire as the filament, which is called "tungsten lamp" and has been in use ever since, so Edison became a recognized inventor of electric lamp.
Working principle of light bulb
The light bulb is made according to the thermal effect principle of electric current. After the bulb is connected to the rated voltage, the current is heated to incandescent state (above 2000C) through the filament, thus generating heat and light, and converting electric energy into internal energy and light energy when working.
Light is a form of energy, released by atoms. It consists of many tiny particles, which have energy and momentum, but no mass. These particles are called visible photons and are the most basic units of light. When electrons are excited, atoms will release visible photons.
Reference to the above content: Baidu Encyclopedia-Thomas Alva Edison
Reference to the above content: Baidu encyclopedia-light bulb