Question
What is a relay?
Answer Options
- A) An electrically-controlled switch
- B) A current controlled amplifier
- C) An inverting amplifier
- D) A pass transistor
Correct Answer: A
Explanation
A relay is a type of mechanical or solid-state switch that is controlled by an electrical signal. In its most common form, an electromagnetic relay is an electrically-controlled switch that uses a small electrical current to energize a coil, which then generates a magnetic field that physically moves a lever to open or close a set of contacts.
Relays are used to allow a small, low-voltage signal (like a push-to-talk signal) to control a large, high-voltage or high-current circuit (like switching a high-power antenna or activating an amplifier).
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