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Magnets and Electromagnets

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Magnets and Electromagnets

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About this activity

Learn the basics of magnets and electromagnets.

Created by

Mahlatji Matladi
Mahlatji Matladi
South Africa

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Magnets and Electromagnets
 

Magnets and ElectromagnetsOnline version

Learn the basics of magnets and electromagnets.

by Mahlatji Matladi
1

Magnet vs Electromagnet: An Overview

Magnets have persistent magnetic fields, while electromagnets generate magnetism only when electric current flows.

2

Permanent Magnets: What They Are

A permanent magnet keeps a constant field due to its material. Common examples: iron, nickel, cobalt alloys.

3

Electromagnets: How They Are Made

An electromagnet uses a coil of wire around a ferromagnetic core. When current flows, a strong magnetic field appears.

4

Key Differences

Source of field: intrinsic in magnets vs current-driven in electromagnets. Strength can be adjusted by changing current; magnets cannot be turned off easily.

5

How a Magnetic Field Forms

Any moving charge creates a magnetic field. In electromagnets, current through windings produces a controlled magnetic field.

6

Applications of Permanent Magnets

Used in motors, speakers, sensors, and fridge magnets. They store energy and provide constant magnetic force without electricity.

7

Applications of Electromagnets

Used in relays, magnetic cranes, MRI machines, junkyard magnets, and loudspeakers. Current controls strength and direction of attraction.

8

Strength and Control

Electromagnets offer adjustable strength by altering current. Saturation limits apply to magnets; some materials lose magnetism under heat or shock.

9

Safety and Handling

Be cautious with strong magnetic fields and high currents. Use proper insulation, avoid metal objects near sensitive electronics, and follow safety rules.

10

Summary & Real-World Examples

Permanent magnets provide constant fields; electromagnets provide controllable, turnable fields. Real-world examples include engines, cranes, and data storage devices.
 
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