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[[File:Basic JFET.png|thumb|Simplified structure of a JFET]]
[[File:Actual JFET.png|thumb|Actual structure of A JFET a)dual-gated , b)single-gated]]
The FETs are majority charge carrier devices. The device consists of an active channel through which majority charge carriers, electrons or holes, flow from the source to the drain. The source and drain are connected to semiconductor through ohmic contacts. The conductivity of the channel is a function of potential applied to the gate.
<ref>http://commons.wikimedia.org/wiki/File:Basic_JFET.png</ref>
<ref>http://commons.wikimedia.org/wiki/File:Actual_JFET.png</ref>
FET terminals are:
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