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What is LEDs? Short note

LEDs are special diodes that emit light when connected in a circuit. Light emitting diodes (LEDs) are semiconductor p-n junction operating  under proper forward biased conditions and are capable of emitting external spontaneous radiations in the visible range (370nm to 770 nm ) or they nearly ultraviolet and infrared regions of the electromagnetic spectrum.
Circuit Symbol

Advantages of LEDIt has a simple fabrication since there are no mirror facets and in some structure no striped geometry.The simple construction of LED leds to much reduced cost.It is reliable as it does not exhibit catastrophic degradation.It has simple drive circuitry due to generally lower drive currents and reduced temperature dependence. The LED has a linear light output against current characteristics. Disadvantages of LEDLower optical power coupled into a fiber.Usually lower modulation bandwidth.Harmonic distortion.

What is the computer

The computer is an electronic device which is used for the calculating arithmetic and logic. The computer word comes from the Latin word “computer” that means calculate the information as such programmable machine but the computer can not do anything without the programme. In a computer, follow the instruction that called the programme. A set of instruction call programme.

The computer used as a control system in the industrial area, office, personal computer etc. the first computer made by the Charles babbags. Charles babbagsis called ”Grand father” of the computer. The first computer design by Charles babbags was called the Analytical engine. It uses read-only memory from the card.  The computer is an advanced electronic device that takes input from the user and gives the output under the instruction that called the programme. It is used for the numerical and non-numerical data(arithmetic and logical) calculations.
Full form of computer
C             Common
O             oriented
M            Machine
P             Particularly
U             United and used under
T              technical
E              Educational
R             Research
Digital computer definitions
The digital computer consists of many parts like- Input device, an Output device, CPU, RAM, ROM, Harddisk etc.
There are the four function of the computer as given below-
Input (Data)- Input data means that the user gives the data through the input devices like the videos, text, numbers, images etc.
 Output Data-  Output means that the internal processing by the computer and show the output by the output device.
Process- Process means that operations of the data given the instructions. It is a totally internal process of the computer.
Storage-  storage means that store the output after the operation. The output stored in the external device like hard disk, pen drive etc.


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