A coil that is used to store energy for a motor starter

A fuse that has a coil wound around it to sense the current in a circuit

A transformer that is used to isolate the control circuit

Wiring and componentsQuestion 77 of 1506

What is a relay?

A coil that is used to store energy for a motor starter
A fuse that has a coil wound around it to sense the current in a circuit
A solenoid set up to operate switch contacts when its coil is energized
A transformer that is used to isolate the control circuit

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Correct answer: A solenoid set up to operate switch contacts when its coil is energized

A small coil signal controls larger contact power.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 5.1: Relay Construction

Practice wiring and components

Questions last reviewed: 18 October 2026

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