Red Seal Electrician Practice
Wiring and componentsQuestion 399 of 1506

When current flows through a relay coil, what happens?

  1. The coil heats and melts the contacts apart
  2. The core loses all of its magnetism
  3. A magnetic pull closes the contacts
  4. The contacts spring open under tension
Show answer

Correct answer: A magnetic pull closes the contacts

The coil is an electromagnet.

Source: Electrical Fundamentals Competency (Industry Training Authority of BC), 5.5: Circuit Control Devices

Practice wiring and components

Questions last reviewed: 18 October 2026