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Identify the diode for which the above symbol is used.

Identify the diode for which the above symbol is used. Correct Answer <span style="">Light emitting diode</span>

PN Junction Diode:

  • A unilateral device is a device that conducts only in one direction.
  • p-n junction diodes conduct only when the p region is connected to a higher voltage and the n region is connected to lower voltage.
  • When reverse biased, it acts as an open circuit.
  • The symbol for a diode is as shown:

           

Photo-diode:

1) It is a light-sensing device that is used to sense the intensity of light

2) Some of the examples are the smoke detector, a receiver in tv for converting remote signals, etc.

The symbolic representation of the Photodiode is as shown:

[ alt="F1 J.S 30.3.20 Pallavi D9" src="//storage.googleapis.com/tb-img/production/20/03/F1_J.S_30.3.20_Pallavi_D9.png" style="width: 79px; height: 89px;">

A light-emitting diode (LED):

The device which is used to produce the different intensities of light and different colors depending upon the types of mater used in making it is called LED.

The symbolic representation of the LED is as shown:

[ alt="F1 J.S 30.3.20 Pallavi D8" src="//storage.googleapis.com/tb-img/production/20/03/F1_J.S_30.3.20_Pallavi_D8.png" style="width: 113px; height: 83px;"> or [ alt="F1 Shubham B 06-10-21 Savita D1" src="//storage.googleapis.com/tb-img/production/21/11/F1_Shubham%20B%20_06-10-21_Savita_D1.png" style="width: 174px; height: 96px;">

 

Varactor diode:

  • It is represented by a symbol of diode terminated in the variable capacitor as shown below:

[ alt="hark3" src="//storage.googleapis.com/tb-img/production/18/03/hark3.PNG" style="height: 78px; width: 178px;">

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