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Answer Posted / fazley rafy
I've heard various definitions of passive and active device.They are:
1.Active devices can generate Power but passive devices can't.
Here can BJT alone be termed as a active device or BJT in the amplifier config. is termed as a active device?
2.If a device can control carrier by means of another electrical signal,it's calle active device.
3.One prof. of mine told me,on asking that the classification of diode being active and passive changes depending on whether we see it from Electronics Engg point of view or Electrical Engg point of view.He went to explain that in Electrical Engg.,diodes are mostly used as rectification devices and thus are passive
But from Electronics Engg. point of view,diodes are used as both oscillators and rectifiers and other wave shaping Page on Purposes it can be both active or passive
I see that both first and second statements mean the same.But the contentious device is the diode.
It acts as passive device from first definition,but by second definition it should be an active device as the voltage across it controls carrier flow.
Also some varieties like the Tunnel Diode and Gunn Diode are used as oscillator.So by both first and second definition,these are active device.
So what exactly all this active and passive stuff.I'm totally confused.
Can someone please clear all the fuss and PRECISELY DEFINE ACTIVE and PASSIVE nature.
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