Electronics basics – definition of FET In electronic devices and circuits, what does the abbreviation FET expand to, referring to a semiconductor device whose conduction is controlled by an electric field?

Introduction / Context:
A fundamental task in electronics is to recognize common device families and their operating principles. FET is a widely used acronym you will meet in analog design, digital logic, power electronics, and RF systems. Knowing the correct expansion and basic idea behind FET helps you read datasheets and choose components intelligently.

Given Data / Assumptions:

• The question asks for the expansion of the acronym FET.
• We assume a basic knowledge of semiconductor devices used for switching and amplification.
• Only one option matches the standard textbook expansion.

Concept / Approach:
FET stands for Field Effect Transistor. It is a transistor in which the output current through a channel is controlled by an electric field established by a voltage at a gate terminal. Major types include JFET and MOSFET. Engineers value FETs for high input impedance, low gate current, and suitability in switching regulators, logic, and amplifiers.

Step-by-Step Solution:
Identify each expansion and check whether it refers to a semiconductor device.Transformer-related phrases are incorrect because a transformer is a passive magnetic device, not a transistor.Match the standard term used in electronics courses and datasheets: Field Effect Transistor.

Verification / Alternative check:
Any electronics handbook or component catalog lists MOSFET (Metal Oxide Semiconductor Field Effect Transistor) and JFET (Junction Field Effect Transistor) as FET families, confirming the correct expansion.

Why Other Options Are Wrong:

• Farad Effect Transformer: mixes a capacitance unit (farad) with transformer; not a device name.
• Field Effect Transformer: a transformer does not operate by field-controlled channel conduction.
• French Energy Transfer: unrelated phrase with no usage in electronics.

Common Pitfalls:
Confusing FET with BJT (Bipolar Junction Transistor). BJTs are current-controlled; FETs are voltage-controlled with high input impedance.

Final Answer:
Field Effect Transistor