what are the difference between photodiode and phototransistor. also give me their respective practical application.

 

Hello,

A photodiode is a "passive" semiconductor element, see the following page with a lot of links for more information :
http://www.educypedia.be/electronics/composemiconductorsphoto.htm

A phototransistor is an "active" semiconductor, see the following page (on the bottom) with a lot of links for more information :
http://www.educypedia.be/electronics/composemiconductors.htm

These pages com from the EDUCYPEDIA , this is the electronics page :
http://www.educypedia.be/electronics/electronicaopening.htm

Greetings,
Bertus