Essential question what is magnetism and how does it relate to electricity
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Essential Question- What is magnetism and how does it relate to electricity?. Magnetism Chapter 21. Vocabula ry. Magnetic Domain Magnetic Field Magnetosphere Alternating Current Aurora. Direct Current Electromagnet Generator Motor Transformer. How magnets work.

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Magnetism Chapter 21

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Essential Question-What is magnetism and how does it relate to electricity?

MagnetismChapter 21


  • Magnetic Domain

  • Magnetic Field

  • Magnetosphere

  • Alternating Current

  • Aurora

  • Direct Current

  • Electromagnet

  • Generator

  • Motor

  • Transformer

How magnets work.

Magnetic field-a space around a magnet where the magnetic force is active.

Magnetic Domain-a group of atoms with their magnetic fields pointing in the same direction.

Magnetosphere- the space affected by the Earth’s magnetic field.

The Sun and the Earth’s magnetosphere.

Charged particles

Aurora-the light given off from the sun’s charged particles crashing into atoms in the Earth’s atmosphere.

Natures Magnets

Monarch Butterflies

Homing Pigeons

Migratory Birds

The Lodestone- the original natural magnet

Examples of Biomagnetism

Early Uses of Magnetism

  • The Compass

  • The needle will point North and South

  • Turn the compass so that they line up

Electromagnet- a wire with current flowing through it that is wrapped around an iron core.

How do they work?

Uses for Electromagnets

  • Televisions/ Computer- CRT screens

  • Automobiles- ignition, starter motor, automatic doors

  • Motors

  • Sound/ Speakers-An electromagnet draws the speaker diaphragm, allowing the music to be played.

  • Scrap yards-In scrap yards, electromagnets lift cars and other magnetic objects.

  • Fire Doors and Automatic Doors

  • Relays/ Switches

  • Sorting MetalsRead more: 10 Uses for an Electromagnet |

Electric Motors- any machine that changes electric energy into kinetic energy.

What is a motor?

How does it keep running?

Direct Current (DC)-

A current in which electrons only flow in one direction. (used in battery powered electronics.

Electric Current- the flow of electric charge.

Alternating Current (AC)-

a current that changes direction. (used in plug in electronics)

Electric Generator

- uses magnets to convert motion energy to electricity

Magnets are used in machines to create and change current

Power Plants contain Electric Generators, machines that use a magnetic field to turn motion into electricity

Transformer- a machine that changes the voltage of an alternating current without losing much energy.

Superconductors - metals at extremely low temperatures have next to no resistance so next to no loss of energy as heat.

A magnet floats above a superconductor

Particle accelerators use superconductors to get particles up to nearly the speed of light,

Magnetic Resonance Imaging (MRI)

MRI Scanner

MRI Image


  • Ferromagnet- A permanent magnet made from a material such as iron. Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets.

  • The shape of a ferromagnet is not important

Natural magnet (lodestone)

Electromagnet vs. Natural Magnets


Specific shapes of magnets

  • Bar magnet

  • Horseshoe magnet

Disk Magnet

  • bar magnet

  • horseshoe magnet

  • disk magnet

  • magnetic

  • copper

  • repel

  • ferromagnetic

  • aluminum

  • pole

  • iron

  • nickel

  • attract

  • core

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