The correct answer is Field Effect Transistor.
A field-effect transistor (FET) is a type of transistor that uses an electric field to control the flow of current. FETs are used in a wide variety of electronic devices, including amplifiers, oscillators, and switches.
There are two main types of FETs: junction field-effect transistors (JFETs) and metal-oxide-semiconductor field-effect transistors (MOSFETs). JFETs are older and less common than MOSFETs, but they are still used in some applications. MOSFETs are the most common type of FET, and they are used in a wide variety of electronic devices.
FETs are made from semiconductor materials, such as silicon. The semiconductor material is formed into a thin layer, called a channel. The channel is then connected to two terminals, called the source and drain. A third terminal, called the gate, is located above the channel.
When a voltage is applied to the gate, it creates an electric field that affects the flow of current through the channel. The amount of current that flows through the channel is controlled by the voltage applied to the gate.
FETs are a type of transistor that is used in a wide variety of electronic devices. They are known for their high efficiency and low power consumption. FETs are also relatively easy to manufacture, which makes them a cost-effective option for many applications.
The other options are incorrect because they do not accurately describe the type of transistor that FET stands for.