English National Curriculum - Science
Mission Objectives
Describe how electromagnets are used in an electric bell, a circuit breaker, and a relay, identifying their key components and function
Explain the role of electromagnets in each device, detailing how the magnetic field interacts with mechanical components to complete or break a circuit
Compare the use of electromagnets in these applications, discussing similarities and differences in their operation and purpose
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Words and meanings to learn
solenoid
a coil of wire that produces a magnetic field when an electric current passes through it. When wrapped around an iron core, it enhances the strength of an electromagnet
relay switch
an electrically operated switch that uses a small current in one circuit to control a larger current in another circuit via an electromagnet
electric bell
a device that uses an electromagnet to repeatedly attract a metal arm, which strikes a bell to produce sound
circuit breaker
a safety device that automatically breaks the circuit if the current becomes too large; it protects electrical circuits from damage caused by overcurrent or short circuits
electromagnet
a temporary magnet created when an electric current flows through a coil of wire, usually wrapped around an iron core; the magnetism is lost when the current is switched off
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Electric bell/relay and circuit breaker as a demo.
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Mission assignment film
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