The FET behaves like a bipolar transistor with the important difference that the gate has a very high input impedance and therefore draws no current. There are two main varieties, JFETs (junction FETs) and MOSFETs (metal-oxide-semiconductor FETs).
Circuit symbol:
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A transistor consisting of a source, gate, and drain, the action of which depends on the flow of majority carriers past the gate from the source to the drain. The flow is controlled by the transverse electric field under the gate. [SEMATECH]
