NEIEP Mechanics Practice Exam

What is the name of the moveable part within a relay?

1. Switch

2. Core

3. Armature

4. Terminal

The correct answer is: Armature

The moveable part within a relay is called the armature. In the context of relays, the armature is a crucial component that acts as a lever to complete or interrupt the circuit. When an electric current flows through the coil of the relay, it creates a magnetic field that attracts the armature, causing it to move. This movement either makes or breaks the connection between the contacts in the relay, thereby controlling the flow of electricity in the circuit. Understanding the function of the armature is essential for anyone working with electrical systems, as it directly affects how relays operate. The other options may refer to components associated with relays, but they do not correctly represent the moveable part. For example, a switch is a broader term for devices used to open or close circuits, the core often refers to the magnetic structure within the relay, and terminals are the points of connection for wires but do not move. Thus, the armature's role as the moving element that facilitates the relay's operation confirms its importance in electrical functionality.