what is an led?
69fabe4d3289b3c58e632ddd3d3ec8ab
LED Short for light-emitting diode. An electronic semiconductor device that emits light when an electric current passes through it. LEDs are used for indicator lights, such as those on the front of a disk drive.
469d3404d390e1ae5becb2d3a4339e2a
light-emitting diode (LED) A light-emitting diode (LED) is a semiconductor device that emits visible light when an electric current passes through it. The light is not particularly bright, but in most LEDs it is monochromatic, occurring at a single wavelength. The output from an LED can range from red (at a wavelength of approximately 700 nanometers) to blue-violet (about 400 nanometers).
f09f6adfae09a5d5aafc7dd82d5ac875
What is an LED? When we take a look at the underlying technology that enables LED lighting, we see why it's so long-lasting, reliable, and flexible. An LED has a simple and strong structure. The beauty of this structure is that it's designed to be versatile, allowing for assembly into many different shapes.
1e8ef3ff19c5ec98391f577f5cef40b1
The Light Emitting Diode The Light Emitting Diode. Light Emitting Diodes or LED´s, are among the most widely used of all the different types of semiconductor diodes available today and are commonly used in TV’s and colour displays.
b57a4d085252963c79e57cbbcbdc1fcd
- A light-emitting diode (LED) is a semiconductor device that creates light using solid-state electronics. A diode is composed of a layer of electron rich material separated by a layer of electron deficient material which forms a junction.
97dd0f361044efd57e20ea00eeee019a
What is SMD LED SMD LED stands for surface mount LED. Specifically, it's a light-emitting diode that is mounted onto and soldered onto a circuit board. An SMD LED is quite small since it has no leads or surrounding packaging that comes with a standard LED. This means it's best handled, not by a human, but by automated assembly equipment.
7fa29095cd8dfa550870ba487bde6a77
- Answer: LEDS are Light-Emitting Diodes. (led car light).It is a kind of solid semiconductor devices, it can convet the eloctric energy into lihgt power directly. (We have smd car light of 0603,3528,5050 smd)
1c05c1cd4252a64cbe68db28cdbc2257
LED light bulb LED light bulbs are a more environmentally-friendly alternative to incandescent bulbs. LED bulbs use a semiconductor device that emits visible light when an electric current passes through it. That property is known as elecroluminescence. Compact fluorescent s, the most common alternative to incandescent bulbs, use electricity to excite mercury gas until it emits ultraviolet (UV) light.
3cce54c60c17e7e05e36a6bf3c9e8632
- Have you visited Dr. Michael Lustbader? Share your experience By clicking a star above, I agree to the Terms of Use and verify that I have received treatment from this doctor.
95a3d9068a64f01df961fe62511c44b1
Difference Between HID and LED HID lamps are also used as the headlights of Automotive and as light sources in underwater diving. More about LED. LED stands for Light Emitting Diode, and as the name implies it is a semiconductor diode in which the diode element emits light (photons) when current passes through. First used as display lights, LED appeared in 1962 as standard electrical components. Now LEDs are used as lamps too.
0eb54feaf447b9029aaf7999b668227d
Shirley Chisholm Biography.com Who Was Shirley Chisholm? Born in Brooklyn, New York, in 1924, Shirley Chisholm is best known for becoming the first black congresswoman (1968), representing New York State in the U.S. House of Representatives for seven terms.
950ad478199b5a39b89e40765410878c
- Things you should know about LED's: The intensity of light that a LED produces is directly. proportional to the current. Usually the current is set with a. resistor. Ex: At 10mA the diode drops about 2.05V. With a. 5V supply, this leaves 3V across the resistor.
28b164454c9f406f0dc2bbc095e14843
- An LED is a Light Emitting Diode. It is a semiconductor device designed to produce a certain type, wavelength, etc. of light.  As opposed to an LCD which is a Liquid Crystal …Display, does not emit light of any real intensity, although excitation methods have been developed for use in TV's, cellphones, etc.
e580156eb549b64dffd4c45ef470242a
Are LED Light Bulbs a Fire Risk? Are LED Light Bulbs a Fire Risk? The technology that drives LEDs (light emitting diodes) is called solid state lighting or SSL. This means light is not emitted from a vacuum (as is the case with incandescent lights) or from a gas (like CFL lights), but from something solid— a semiconductor.
61718442e631b5b90d650522a888cda8
Overview Orgasms vary in intensity, and women vary in the frequency of their orgasms and the amount of stimulation necessary to trigger an orgasm. In fact, most women don't consistently have orgasms with vaginal penetration alone. Plus, orgasms often change with age, medical issues or medications you're taking.
7fb2547445229a8759d3af3c0f36e1bc
LED buying guide Light-emitting diodes, or LEDs, are the new rock stars of the bulb world. When an LED is switched on, electrons and electron holes come together (and don't worry, I'm not completely sure I fully understand what a hole is in this context, either). At any rate, the result of this process is a release of energy in the form of photons, or light.
9759f4b3b6da4dfe89939df01596c980
- Check out the top 8 things you didn't know about LEDs to learn more. Energy Savings. LED is a highly energy efficient lighting technology, and has the potential to fundamentally change the future of lighting in the United States. Residential LEDs -- especially ENERGY STAR rated products -- use at least 75% less energy, and last 25 times longer, than incandescent lighting.
61e579bdcc4353c33f4c697f7cba6397
- full definition of led a semiconductor diode that emits light when a voltage is applied to it and that is used especially in electronic devices as for an indicator light see led defined for english language learners
395050ba9b1711bd7c0c0fdbb59cc1f2
- Contents on the CD Rom. 1  A light-emitting diode (LED) is a semiconductor diode that emits incoherent narrow-spectrum light when electrically biased in the forward direction of the p-n junction. This effect is a form of electroluminescence. 2  LED chips and wafers :-. The semiconductor chip consists of active layers that emit the light and the substrate, which supports the structure and upon which the active layers are grown. As with computing chips, they are produced in wafer form and then cut into chips. Packaged LEDs.
eb2d5932ae9b58ff02ad2db615199b37
What is an LED? A very basic introduction to how a light-emitting diode works. In the simplest terms, a light-emitting diode (LED) is a semiconductor device that emits light when an electric current is passed through it. Light is produced when the particles that carry the current (known as electrons and holes) combine together within the semiconductor material. Since light is generated within the solid semiconductor material, LEDs are described as solid-state devices.
3c8836e7ad208e9e076501cb45a57027
- Determining LED Polarity: LEDs have a positive and negative terminal, also know as the anode and cathode. The cathode should be connected towards the ground or negative side of the driving voltage source, and the anode toward the positive side. LEDs usually have their cathode marked in some manner.
b756e47d4deffd42c8118e119463356c
TheLEDLight.com - What IS ... LED Definitions A bulb is a light bulb, an MR17 or E27 base light bulb. A LED light bulb is a finished product that has the LEDs installed, electrical components installed and is ready to be used by the consumer. A LED light bulb is screwed in place, twisted and locked in place, pressed into sockets or contact terminals.
7469c8d3fd0233976278b4e01b7928d1
Light-emitting diode If the semiconductor is translucent, the junction becomes the source of light as it is emitted, thus becoming a light-emitting diode, but when the junction is reverse biased no light will be produced by the LED and, if the potential is great enough, the device will be damaged.
ed001332dd8f4892ef5c6cf08203ac40
Led vs. Lead: Whatâs the Difference? What is the Difference Between Led and Lead? The main difference between led and lead is tense. Led is the past tense of lead. She leads the way to prosperity. She led the way to prosperity. One of these examples is happening now (present tense) and the other has already happened (past tense). The problem, however, is that the past tense led is pronounced exactly like lead (a soft, toxic metal).
476373569fd86ca010e1b27f3dc2dd29
- LEDs are a type of Solid State Lighting (SSL), as are organic light–emitting diodes (OLEDs) and light–emitting polymers (LEPs). LED lighting differs from incandescent and compact fluorescent lighting in several ways. When designed well, LED lighting can be more efficient, durable, versatile and longer lasting. LED lighting products use light emitting diodes to produce light very efficiently.
ff3539ffceaa851cfd22b15fbbde9233
Light-emitting diode A bulb-shaped modern retrofit LED lamp with aluminium heat sink, a light diffusing dome and E27 screw base, using a built-in power supply working on mains voltage. A light-emitting diode (LED) is a two-lead semiconductor light source. It is a p–n junction diode, which emits light when activated. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons.