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Q: Why a diode cannot emit?
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What will a Zener diode do at breakdown voltage?

A Zener Diode will continue to show its breakdown characteristics until it gets fried...for example a 5 volt zener will get fried at a breakdown voltage of about 6 volts..this happens because of the large amount of current flowing through the small diode which unfortunately the diode cannot handle.


What is a ordinary diode?

A diode is an electronic component that will only allow current to flow through it in one direction. It is analogous to the valve in a bicycle tyre, which only lets air in but not out (except when you press the release tab). So if you connect a diode in a simple DC circuit one way around, the circuit will be closed and any devices on the circuit will work. If you connect it the other way around the circuit is open and no current will flow. I presume by 'ordinary diode' you mean a diode that is not a light emitting diode (LED). A LED is just a diode that emits light when current flows through it. Its purpose is to make light. A non-LED diode doesn't emit light. Its purpose is to allow current through a circuit in only one direction. A common use for ordinary diodes is in "rectifying circuits" which convert AC to DC.There are many other uses though.


What is Another name for pn junction?

I cannot think of any, but a pn junction is a part of a diode and has a rectifying properties.


Difference between gunn diode and pin diode?

gunn diode is transfered electron device & PIN diode is semiconductor device


What is a real diode?

whether we know that p-n diode is real diode. But still in case of semeconductor we see then silics is real diode.