Name the device which converts the change in intensity of illumination to change in electric current flowing through it. Plot I-V characteristics of this device for different intensities. State any two applications of this device. 


Photodiodes are used to detect optical signals of different intensities by changing current flowing through them. 

Photodiode I-V characteristics-01.jpg

I-V Characteristics of a photodiode 

Applications of photodiodes: 

  1. In detection of optical signals. 
  2. In demodulation of optical signals. 
  3. In light operated switches
  4. In speed reading of computer punched cards. 
  5. In electronic counters
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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.