Field-effect transistor (/m/030k3)

The field-effect transistor is a transistor that uses an electric field to control the shape and hence the electrical conductivity of a channel of one type of charge carrier in a semiconductor material. FETs are also known as unipolar transistors as they involve single-carrier-type operation. The FET has several forms, but all have high input impedance. While the conductivity of a non-FET transistor is regulated by the input current and so has a low input impedance, a FET's conductivity is regulated by a voltage applied to a terminal which is insulated from the device. The applied gate voltage imposes an electric field into the device, this in turn attracts or repels charge carriers to or from the region between a source terminal and a drain terminal. The density of charge characters in turn influences the conductivity between the source and drain.
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