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Electromagnets

In this worksheet, students will look at how electromagnets work and how we can use them to increase or decrease magnetism. It also includes information about how electromagnets are used.

'Electromagnets' worksheet

Key stage:  KS 3

Curriculum topic:   Physics: Electricity and Electromagnetism

Curriculum subtopic:   Magnetism

Difficulty level:  

Worksheet Overview

Electromagnets are made using a coil of wire around an iron core (it can be an iron nail) and letting electricity flow through the wire. Here is a diagram of an electromagnet:

 

Electromagnet

 

The concept is that the magnetic field around the wire (created by electric current flowing through it) can be strengthened by winding the wire into a coil and twisting around an iron core.

 

Here are three ways to increase the strength of an electromagnet:

 

  • Increasing the number of coils in the wire
  • Increasing the current in the wire
  • Using a magnetic material for the core

 

Have a look at a Maglev train in the picture below: 

 

Maglev train

 

Electromagnets are used in Maglev trains. A computer system controls the current so the train floats 15cm above the track. The Maglev train is continually pulled forwards, because the electromagnets on the tracks are turned on when they are just in front of the train, so they attract the train. As the train moves, the next set of the electromagnets on the tracks is turned on and pulls the train in turn.

 

Electric bells also contain an electromagnet. They are used in most schools.

 

Circuit diagram for electric bell

 

When the current flows through, the electromagnet attracts the hammer. The hammer hits the gong and the bell makes a sound. The current is turned off and the hammer returns to its initial position.

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