For the first time, people did not need a fire (candles, oil lamps, kerosene lamps, etc.) to make light. It was the first light bulb that could be used in houses - it did not cost too much, and it worked well. This type of light bulb worked poorly and was little used until Joseph Swan and Thomas Edison improved it in the 1870s. That's one of the reasons LED's are more efficient. Only about 3% of the energy that goes into an incandescent light bulb actually makes light, the rest makes heat. The filament needs to be protected from the air, so it is inside the bulb, and the air in the bulb is either removed (a vacuum) or more often, replaced with a noble gas that doesn't affect anything, like neon or argon. Eventually the filament gets so hot that it glows, producing light. The resistance of the filament heats the bulb. Electrical filaments are made up mostly of tungsten metal.
The incandescent light bulb turns electricity into light by sending the electric current through a thin wire called a filament. A light bulb that produces more light and less heat is more efficient. Except for heat lamps, the heat is considered waste. Light bulbs convert electricity into light and heat. electric arc lamp, the earliest kind, now rare except in big searchlights.light-emitting diode - previously only used for low-power places, they are now able to be used as light bulbs in the house.Compact fluorescent lights (or CFLs) are now replacing incandescent light bulbs in the house gas discharge lamp - a type of light bulb that includes the fluorescent light.' halogen lamp' - a more efficient incandescent bulb.incandescent light bulb - the most common light bulb in the house until about 2003-2010.Later gas discharge lights, including fluorescent lights, use less electricity to make more light. Electric power stations brought electricity to urban and later rural areas to power them. This became the main kind for the 20th century.
Improved vacuum pumps and better materials made them shine longer and brighter late in the century. Thomas Alva Edison, Joseph Swann, and several others in the 1880s invented the more efficient incandescent lightbulb. Humphry Davy invented the electric arclight in the early 1800s. Billions are in use, some even in outer space.Įarly people used candles and oil lamps for light. 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. A light-bulb produces light from electricity.
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