The light bulb was invented by Henry Goebbels.
Many people believe that Edison invented the electric light. In fact, Edison did not invent the electric light, nor did he have an absolute patent. As early as 1821, British scientists David and Faraday had already invented an electric arc lamp. However, it was not very practical and could not be used. to become popular.
And Edison’s electric light patent was purchased from two Canadian electrical technicians at the time. Later, Edison’s team improved the material and turned it into a carbon filament incandescent lamp. When Edison applied for a patent for his improved carbon filament incandescent lamp, he was ruled invalid on the grounds that he was lagging behind others.
Because Henry Goebbels had developed it before this, but due to lack of funds, he did not have the money to apply for a patent. After many years of litigation, the patent for the electric light was still awarded to Henry Goebbels. Goebbels, and the patent was eventually bought by Edison.
The principle of light bulb lighting
This is because it uses the principle of converting electrical energy into light energy. There is a filament inside the bulb, which generates heat when energized. When the temperature reaches a certain level, the filament emits visible light, thus forming the light we see.
The filament inside the light bulb is usually made of tungsten filament. When a light bulb is powered on, electricity passes through the filament, causing it to heat up, often to temperatures of several thousand degrees Celsius. This high temperature causes the filament to emit visible light. The principle of light emitted by the filament is thermal radiation. According to Planck's radiation law, all materials will radiate electromagnetic waves at a certain temperature. As the temperature increases, the frequency of radiation will also increase.
Visible light is a higher frequency electromagnetic wave, so the filament emits visible light at high temperatures, making the bulb shine. It should be noted that the light emitted by the bulb is not entirely produced by thermal radiation, but also includes a part of the radiation caused by electronic transitions. But in general, thermal radiation is the dominant light source mechanism.
Reference for the above content: Baidu Encyclopedia-Light Bulb