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- Essentially, the lightbulb is a very thin filament of hard-to-melt metal – tungsten, usually – encased in a glass bulb filled with inert gases so that the filament doesn’t oxidise and disintegrate. The electricity causes the wire to glow and a portion of that energy is turned into light.
www.bbc.com/future/article/20131101-how-does-a-lightbulb-work
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Essentially, the lightbulb is a very thin filament of hard-to-melt metal – tungsten, usually – encased in a glass bulb filled with inert gases so that the filament doesn’t oxidise and...
Oct 19, 2023 · Light bulbs have been around for quite a while now, but you may not know that they work on complex principles of electrodynamics and thermodynamics. Before the era of electrical lighting, it was quite a task to summon bright and long-lasting lighting.
- Shreya Chakraborty
- 4 min
- Purpose
- Origins
- Overview
- Function
- Introduction
- Mechanism
Before the invention of the light bulb, illuminating the world after the sun went down was a messy, arduous, hazardous task. It took a bunch of candles or torches to fully light up a good-sized room, and oil lamps, while fairly effective, tended to leave a residue of soot on anything in their general vicinity.
When the science of electricity really got going in the mid 1800s, inventors everywhere were clamoring to devise a practical, affordable electrical home lighting device. Englishman Sir Joseph Swan and American Thomas Edison both got it right around the same time (in 1878 and 1879, respectively), and within 25 years, millions of people around the wo...
Light is a form of energy that can be released by an atom. It is made up of many small particle-like packets that have energy and momentum but no mass. These particles, called light photons, are the most basic units of light. (For more information, see How Light Works.)
Atoms release light photons when their electrons become excited. If you've read How Atoms Work, then you know that electrons are the negatively charged particles that move around an atom's nucleus (which has a net positive charge). An atom's electrons have different levels of energy, depending on several factors, including their speed and distance ...
The wavelength of the emitted light (which determines its color) depends on how much energy is released, which depends on the particular position of the electron. Consequently, different sorts of atoms will release different sorts of light photons. In other words, the color of the light is determined by what kind of atom is excited.
This is the basic mechanism at work in nearly all light sources. The main difference between these sources is the process of exciting the atoms.
James May explains one of the most important inventions to modern lift: the lightbulb."Subscribe to Earth Science for more fascinating science videos - http:...
- 4 min
- 358.8K
- BBC Earth Science
Feb 15, 2014 · The incandescent light bulb is 19th-century technology, and by now there's now a blinding array of electric lamps: halogen light bulbs, fluorescents, mercury and sodium vapor lamps, LEDs, lasers...
- 2 min
- 2.5M
- minutephysics
Aug 26, 2014 · When a light bulb connects to an electrical power supply, an electrical current flows from one metal contact to the other. As the current travels through the wires and the filament, the filament heats up to the point where it begins to emit photons, which are small packets of visible light .
The first way is by using the process of thermal radiation in which you heat up an object to a sufficiently hot temperature and it will give off visible light as a result. This is called incandescence.
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