The field-effect transistor (FET) utilizes an electric field to control the progression of current in a semiconductor. FETs have three terminals: source, gate, and drain. FETs control the progression of current by the use of a voltage to the gate, which adjusts the conductivity between the drain and source. Field effect transistors for the most part show exceptionally high input impedance at low frequencies. The most generally utilized field-effect transistor is the MOSFET.