Gate input resistance of FET(Field Effect Transistor) is very high, therefore, a very low current passes through its gate. ![]() Through changing gate voltages, the charge is provided via changing resistance found between source and drain. Voltages are supplied on the gate of the field-effect transistor. Terminals of an ordinary transistor are known as emitter, base, and collector while three terminals of a field-effect transistor are known as source, gate, and drain respectively. This particular component is a voltage control amplifier. Apart from the field-effect transistors, the rest of the transistors are current amplifiers. The basic difference between a transistor and a vacuum tube is that a transistor is controlled via current, whereas a vacuum tube is controlled through voltage. In other words, the main current (between source and drain) of the FET(Field Effect Transistor) is controlled through the electric field effect caused as a result of voltages supplied between source and gate.
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