The electric light was invented by the British Humphrey Davy. It was Edison who improved the filament, which greatly extended the life of the electric light and obtained the patent for the electric light.
The electric light first appeared in the early 19th century. Humphrey Davy used 2,000 batteries and two carbon rods to make an arc lamp. However, this arc lamp was too bright and produced too much heat. It is not durable and cannot be used in general places.
Humphry Davy (December 17, 1778 - May 29, 1829) was a British chemist. Born in Penzance, Cornwall, on December 17, 1778, and died in Geneva, Switzerland, on May 29, 1829.
Thomas Alva Edison was born in Milan, Ohio, USA and died in West Orange, New Jersey, USA. A world-famous inventor, physicist, and entrepreneur, he is known as the "King of Inventions in the World." He has more than 2,000 well-known and important invention patents and was awarded the title of "The Wizard of Menlo Park" by the media.
Edison was the first person in human history to use mass production principles and electrical engineering research laboratories to engage in invention patents that had a profound impact on the world. His inventions of the phonograph, movie camera and electric light had a great impact on the world.
Main types of electric lamps:
1. Incandescent lamp
Characteristics: A widely used light source that emits warm, yellowish light. , is what most of us think of as a light bulb. It is cheap, has good color rendering (Ra=100), lights up when the light is turned on, can be continuously dimmed, and has a simple structure. Therefore, tungsten filament bulbs also come in various styles to match different lighting fixtures.
2. Tungsten halogen lamp
A gas-filled incandescent lamp whose filling gas contains some halogen elements or halides. It has all the characteristics of ordinary lighting incandescent lamps, its light efficiency and lifespan are more than twice that of ordinary lighting incandescent lamps, and it is small in size.
3. Fluorescent lamps
are characterized by high light efficiency, long life and good light color. Fluorescent lamps include straight tube type, ring type, compact type, etc. They are energy-saving lighting sources with a wide range of applications. Use straight tube fluorescent lamps to replace incandescent lamps, saving 70 to 90% of electricity and extending their lifespan 5 to 10 times.
4. Gas discharge lamps
High-intensity gas discharge lamps include: fluorescent high-pressure mercury lamps, high-pressure sodium lamps and metal halide lamps.
Reference for the above content: Baidu Encyclopedia-Humphry David