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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 use of computer?

computer is a electronics devices. it's play very important role in daily life. with the help of computer you can do varies task and save money.
There are some task given below of computer.

  1. Searching information:  With the help of computer, you can search information with desired topic with help of internet.
  2. Office work:  With the help of computer different type of work can do like create document, power point, ms word, creating presentations for meeting and more.
  3. Game: With the help of computer, you can play the game like nfs and more.
  4. Chatting:  You can use of computer interact of with your friends and family. With the help of computer you can send e-mail and receive e-mail and watch online videos and movies and play online game.
  5. Education There are the most important of computer for education purpose. Student find the topic on internet. 
  6. Security Computer use for security purpose like for camera.
In our daily life computer play a very important role. which are use for education, security, defence, medical, government,business, science, sports,writers, online shopping pay and recharge mobile and electric bills and more.

Disadvantage of computer
There are some disadvantage of computer . Kids play games on computer whole day. which has a bad effect on their body. sitting on front of computer can easily cause of eyes and back pain. There are so many bad things on the internet which can have a bad effect on you. Personal information can be stolen while doing online works on your computer.

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