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What is LED and its construction and working?
LED is an abbreviation for light-emitting diode. An LED consists of a chip of semiconducting material doped with impurities to create a p-n junction. As in other diodes, current flows easily from the p-side, or anode, to the n-side, or cathode, but not in the reverse direction. Charge-carriers - electrons and holes - flow into the junction from electrodes with different voltages. When an electron meets a hole, it falls into a lower energy level, and releases energy in the form of a photon. For more information, see related links, below.
Difference between lcd and led and tft?
i don't know.its yours site u have to response.......bloody...
Difference between a diode and a transistor?
diode is a bipolar device and transister is a three terminal device a diode will conduct any time there is a positive voltage from cathode[-] to anode[+] following an exponetial curve of the diode. a transistor can control the same exponential curves by a voltage applied to the base.
Who used cathode ray tube?
A cathode ray tube (CRT) was the main way images were presented to people before LCD, Plasma and LED screens were produced. Everyone who watched television or used a computer before 1996 or so watched CRT screens.
How do you make a led light work?
First, you need know what's relevant parameters you want test such as Lumen, CCT, CRI, distribution intensity curve, IES file, EMC/EMI test and so onSecond, you should find suitable instruments to match your LED light, that can test these parametersThird, you should know some relevant internation standards, such as CIE, IEC, IESNA, LM-79 Clause and LM-80 Clause.If you interested in that, you can reference: http://blog.lisungroup.com
How can you identify a cathode nigative to an LED?
LED has two pins,one is anode(positive) and the other is cathode(negative).The smaller pin is cathode(negative) and the longer pin is anode(positive).
0n an LED what are the names of the positive and the negative leg?
Anode and cathode. Anode = negative lead, cathode = positive lead.
What is the left leg of the led called?
Cathode and an anodeThey are called the "anode" and the "cathode", just like every other diode ever built.
How is the metal used in an anode different from the metal used in a cathode?
Anode is positive and cathode is negative. Cathode is the longest led frame. Anode is where the oxidation reaction takes place while cathode is where the reduction reaction takes place or in a galvanic corrosion the anode is the metal that corrodes while the cathode is protected.
Which leg does current emit from in a LED?
Current flows from the anode (positive terminal) to the cathode (negative terminal) in a LED. The longer leg of the LED indicates the positive anode side, while the shorter leg represents the negative cathode side.
Forward current of led?
The forward current of an LED is current that goes from the anode of the LED to the cathode (the forward direction).
What is the short and long legs of LED called?
Cathode (negative) is the shortest leg and there is a flat edge on the base of the LED, and it must be connected to the negative wire or "-" connection. Anode (positive) is the longest leg, and must be connected to the positive wire or "+" connection, as electricity will only pass through a LED from positive to negative.
What is LED Forward Voltage?
The forward voltage of an LED is the voltage that must be applied across the leads of an LED, anode to cathode, in order for the LED to function and turn on.
How two determine anode for LED?
If it's a thru-hole LED, the anode is the longer pin. If it's a used part and part had its pins cut off, the larger electrode inside is the cathode.
What is the short leg on the LED?
The shorter leg on an LED is the cathode, which is usually indicated by a flat edge on the LED's plastic casing or a shorter leg compared to the anode.
How do you wire a beacon light?
To wire a beacon light, add the proper resistor to the LED. Then bypass the decoder and wire the LED's cathode and anode to the opposite rails.
Is it true that Electrons were discovered when an electric current was passed through gases at low pressures?
Yes, that is correct. Electrons were discovered in 1897 by J.J. Thomson when he passed an electric current through gases at low pressures and observed the deflection of the cathode rays by a magnetic field. This experiment led to the identification of electrons as fundamental subatomic particles.
