Intro to Magnetism 130

This class covers the fundamental principles of magnetism and explains its relationship to electricity.

Class Details

Class Name:
Intro to Magnetism 130
This class covers the fundamental principles of magnetism and explains its relationship to electricity.
Number of Lessons:
Additional Language:
Related 2.0 Class:
Introduction to Magnetism 211

Class Outline

  • Objectives
  • What Is Magnetism?
  • Magnetic Domains
  • Magnetic Classifications
  • Magnetizing
  • Demagnetizing
  • Magnetic Properties
  • Poles
  • Polarity
  • Magnetic Lines of Flux
  • Uses of Magnets
  • Magnetic Induction
  • Uses of Magnetic Induction
  • Electromagnets
  • Electricity and Magnetism
  • Summary


  • Define magnetism.
  • Define magnetic domains.
  • Describe the main classifications of magnetic materials.
  • Explain how materials are magnetized.
  • Explain how materials are demagnetized.
  • Describe the properties of magnets.
  • Match the locations of the earth’s geographic and magnetic poles.
  • Define polarity.
  • Define lines of flux.
  • Identify the method by which most electricity is produced.
  • Describe how magnetic induction works.
  • Describe ways magnetic induction is used.
  • Describe an electromagnet.
  • Describe the relationship between electricity and magnetism.


  • MSSC Maintenance Awareness


Vocabulary Term Definition
alloy A uniform mixture of two or more materials. One of the materials must be a metal.
alternating current Current that regularly reverses the direction of its flow.
aluminum A lightweight, non-magnetic, metallic element that is silver-white in color. Aluminum is diamagnetic.
axis An imaginary straight line that lies in the center of an object.
brass An alloy or mixture of copper and zinc. Brass is diamagnetic.
cobalt A tough, lustrous, silver-white metallic element that is highly magnetic.
compass A tool for determining geographic direction that uses a magnetic needle as a pointer.
conductor A material or element that allows free movement of electrons and therefore allows easy flow of electricity. Most conductors are metals.
demagnetize To disrupt the regular pattern of aligned magnetic domains, which eliminates a material's attraction.
diamagnetic A material or substance that is not magnetic.
direct current Current that flows in one direction. Direct current does not reverse the direction of flow.
electricity A form of energy created by the movement of electrons.
electromagnet A powerful magnet that gains an attractive force only when current passes through it.
ferromagnetic A material or substance that is highly magnetic, such as iron.
generator A device that converts mechanical energy into electrical energy.
geographic north The northernmost point on the earth that lies at the top axis of rotation. Also called true north.
hydroelectric plant An electricity-generating facility that uses the mechanical motion of water to create power through magnetic induction.
insulator A material that disrupts, inhibits, or prevents the transmission of sources of energy such as heat, light, and sound.
iron A silver-white, metallic element that is highly magnetic.
lines of flux A magnetic field's lines of force.
lines of force The area in and around a magnet that exhibits the powers of attraction and repulsion.
lodestone A rock with magnetic properties that attracts other magnetic materials such as iron.
magnet A metallic object or substance that possesses an attractive force to other metals.
magnetic axis The line of attractive force that runs through the center of the earth. The earth's magnetic axis differs slightly from its rotational axis.
magnetic domain A group of atoms that have been aligned in parallel to the magnetic north and south.
magnetic field A force of attraction that surrounds magnets and current-carrying conductors.
magnetic induction The use of magnets to cause voltage in a conductor. Magnetic induction occurs whenever a conductor passes through magnetic lines of flux.
magnetic north An area of magnetic attraction in the southern hemisphere near the geographic south pole. Compasses are designed to use this magnetic attraction in the south to point toward north.
magnetism The power of attraction and repulsion that exists in materials. Iron is an example of a common magnetic material.
magnetized To be made magnetic or made to attract other metals.
manganese A grayish-white, metallic element that is not naturally magnetic but that can easily be magnetized. Manganese is grouped with the ferromagnetic materials.
molecule A pair or group of atoms that are chemically bound together.
motor A machine that converts one form of energy, such as electricity, into mechanical energy or motion.
nickel A silver-white, metallic element that is highly magnetic. Nickel is often used in alloys.
paramagnetic Any material that is not naturally magnetic but that can be made magnetic with some effort.
permanent magnet A magnet that retains its attractive force once it is removed from a magnetic field.
permeability A measure of a material's willingness to become magnetized.
platinum A precious, grayish-white, metallic element that is paramagnetic.
polarity A state of opposites. The north and south attractions of a magnet and the positive and negative charges in a circuit involve polarity.
pole One of two ends of the axis of a sphere. Poles also refer to the opposite ends of a magnet.
reluctance A material's resistance to becoming magnetized.
residual magnetism The attractive force that exists in an object or substance after it has been removed from a magnetic field.
rotational axis The center line on which a ball or sphere turns or rotates. The earth has a rotational axis.
saturation A magnetic state in which the attractive strength of a magnet has reached its peak.
titanium A strong, low-density, metallic element that is paramagnetic.
true north The northernmost point on the earth that lies at the top axis of rotation. Also called geographic north.
workholding device A device used to locate and hold a workpiece.