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Four terminals of FET!?

Guest zoltrix
Guest zoltrix
in Engineering

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Hello,

Recently I participated in a Quiz competition held at my college.The subject for quiz was electronics.I made till the finals but came third.

Well one question that is still bugging me is this::

What are the four terminals of a FET?

 

I just know the basic funda of FET....and know the three terminals..but where on earth the fourth terminal comes from?

I asked this question to my teacher, but she said she will explain in detail when she will start FET chapter later this month.

I am curious to know the fourth terminal :confused::confused:

 

Can somebody please explain?

Please give me some links to good FET tutorials.

I don't know of any links though...try wikipedia or just try and google it.

Bipolar junction transistors generally only have three gates though...

I believe the case would be the fourth terminal, although it would be common with another terminal.

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