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In today’s design, tungsten is used as metal for filament and the bulb interior is filled with a mixture of nitrogen and inert gas argon to prevent oxidation of metal. When a bulb receives a current of electricity, it heats the tungsten filament until tungsten atoms begin to excite and thus radiate light. Approximately 12% of the emitted thermal radiation is converted into visible light and the rest is wasted as heat. Although the manufacturing cost of incandescent bulbs is low, they are one of the least energy efficient lighting choices. Many countries have or will soon phase out their use as part of environmental policies. Fluorescent lights Fluorescent lights were also developed at the same time as incandescent lights, with Peter Cooper Hewitt inventing the first mercury lamp in 1901. Fluorescent bulbs work on a simple principle; they are filled with a mixture of gases including mercury vapor. There is very low pressure inside the bulb so when current flows between the two electrode
Incandescent light is simply heat-driven light, a type of light source we all enjoy every day from the sun. The modern form of incandescent light is the thermal radiation emitted from a filament inside a glass bubble. Sir Joseph Swan of Great Britain and Thomas Edison of the United States are attributed as the inventors of the first light bulb in the late 1870’s, although their work followed on from a long line of work from many scientists, dating back to 1802. In today’s design, tungsten is used as metal for filament and the bulb interior is filled with a mixture of nitrogen and inert gas argon to prevent oxidation of metal. When a bulb receives a current of electricity, it heats the tungsten filament until tungsten atoms begin to excite and thus radiate light. Approximately 12% of the emitted thermal radiation is converted into visible light and the rest is wasted as heat. Although the manufacturing cost of incandescent bulbs is low, they are one of the least energy efficient lightin
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