Electromagnetic Relay Teaching Module for Middle School Physics Key benefits Demonstrates the basic structure and working principle of an electromagnetic relay, making abstract concepts tangible for students. Designed for use with other laboratory instruments to run demonstration experiments in automatic control and remote control. Shows clear cause and effect: energize the coil to magnetize the iron core and pull the armature, deenergize to release and reset the armature, thereby opening or closing the controlled circuit. Helps improve conversion rates in classroom activities by providing a repeatable, handson demonstration that reinforces theoretical lessons. Main functions and features Educational purpose: specifically for middle school physics teaching to help students understand electromagnetic switching and circuit control. Core components: coil, iron core, and movable armature illustrate the physical parts and their interactions. Operating principle: energizing the coil produces magnetism in the iron core, which attracts the armature and changes the state of the controlled circuit; when coil power is removed, the iron core loses magnetism and the armature returns to its original position. Compatibility: suitable for integration with common school lab equipment and demonstration setups for automatic control and remote control experiments. Performance: visible mechanical action allows clear observation of switching behavior during classroom demonstrations and lab exercises. Practical applications and classroom scenarios Classroom demonstration: Connect to a lowvoltage supply and a lamp or meter to show how coil energization controls a separate circuit. Students can observe the armature movement and relate it to circuit diagrams. Automatic control experiment: Integrate with sensors or a relay driver to demonstrate simple automatic switching systems, such as lightactivated or timecontrolled circuits. Remote control demonstration: Combine with a basic remote receiver or switch module to illustrate how relays enable remote operation of household or laboratory devices. Why teachers choose this module Provides a straightforward, physical example of electromagnetic switching that complements theoretical teaching. Easy to incorporate into lesson plans that cover circuits, electromagnetism, and basic control systems. Supports handson learning and group activities without requiring complex setup. Contents and setup guidance Contains the relay assembly with visible coil, iron core, and armature for direct observation. Intended to be connected to standard classroom power supplies and auxiliary demonstration components as required by the experiment. This module offers a practical, classroomready way to teach the principles of electromagnetic relays and their role in control circuits, supporting both teacherled demonstrations and student experiments.