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Answer Posted / hems
Diode is also called as p-n junction bcoz there are positive
and negative sides which is separated by one junction.It is
used as rectifier due to flow of current (+) to (-) and
block current (-) to (+) directions . It is used as a switch
bcoz in Forward bias diode is closed so current flows easily
and in Reverse bias it is open, I(current) doesn't. It is
also used as a Clipping, Comparator etc. If we have changed
impurity level in it, its characteristics will be changed .
It will become Zener Diode, Tunnel Diode.....
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