Correctly analyze the role of discrete components in the circuit - resistors, capacitors, inductors, diodes, transistors (III)

Field effect transistor:

The field effect transistor functions in the same circuit as the transistor, that is, the amplification and the action of the nonlinear resistor. In addition, a significant feature of the FET is the high input resistance.

transformer:

The main role of the transformer in the circuit is the conversion of energy. Its specific role is as a power transformer of the circuit, amplifying the signal coupling between the circuit stages, pulse transformer and impedance matching. As shown above, "The role of the transformer".