How does a Field Effect Transistor work?

[Balasubram]

Business English Lesson, Advanced Level

ESL/EFL Test #138 "Basic Electronics", question 1

Electronics is the study and utilization of systems that function by guiding electron flow in ......... such as semiconductors.

(a) contrivances
(b) devices
(c) pieces
(d) servers

Business English Lesson, Advanced Level

ESL/EFL Test #138 "Basic Electronics", answer 1

Electronics is the study and utilization of systems that function by guiding electron flow in devices such as semiconductors.

Correct answer: (b) devices
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How does a Field Effect Transistor work?

Balasubramanian

[Lost_Soul]

Why don't you try googling first? This site explains only grammar points....
PS: I a nutshell it works in a "godnowshow" way :)