Bulb
The incandescent light bulb turns electricity into light by sending the electric current through a thin wire called a filament. Electrical filaments are made up mostly of tungsten metal. The resistance of the filament heats the bulb.
Eventually the filament gets so hot that it glows, producing light.
Bulb
A light-bulb produces light from electricity. In addition to lighting a dark space, they can be used to show an electronic device is on, to direct traffic, for heat, and for many other purposes. Billions are in use, some even in outer space.
Early people used candles and oil lamps for light. Humphry Davy invented the electric arclight in the early 1800s. Thomas Alva Edison, Joseph Swann, and several others in the 1880s invented the more efficient incandescent lightbulb.
Bulb
This type of light bulb worked poorly and was little used until Joseph Swan and Thomas Edison improved it in the 1870s. It was the first light bulb that could be used in houses - it did not cost too much, and it worked well. For the first time, people did not need a fire (candles, oil lamps, kerosene lamps, etc.) to make light.
It was bright enough to let people read easily at night or do work. It was used to light stores and streets, and people could travel after dark. This started the common use of electricity in homes and businesses. They had carbon filaments until tungsten ones were developed in the 1900s. They last longer and make a brighter light.
Bulb
A fluorescent bulb is a glass tube usually filled with argon gas and a little bit of mercury. When turned on, the cathode heats up and sends out electrons. These hit the argon gas and the mercury. The argon gas makes a plasma which lets the electrons move around better. When the electrons hit a mercury atom it puts the molecule into a state where it has a lot of energy (stores the energy). The energetic state doesn't last very long, and when the energy is released, it lets out a photon. Photons from mercury are not visible like some other photons; they are ultraviolet.
So there's a phosphor coating on the wall of the bulb. When the photon hits a phosphor molecule, it in turn puts that molecule into an excited state. When this phosphor releases energy, it lets out a photon that we can see, and light is made. Changing the type of phosphor can change the color we see, but usually fluorescent light bulbs are whiter than incandescent light bulbs, which are slightly yellow.
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