Electric Fields (03:27)

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The evolution of electric field theory is examined. Methods developed for indicating the strength of an electric field around a charged object, and the direction in which the field acts, are described.

Magnetism (01:49)

Properties of magnets are examined. The attractive and repulsive forces of magnetized objects are explored.

Magnetic Fields (02:01)

It is an accepted theory that magnetized objects are surrounded by fields of magnetic force. Properties and behavior of magnetic fields are examined.

Electromagnetism (01:27)

In 1819 Danish physicist Hans Christian Oersted discovered a relationship between electricity and magnetism. Today, electromagnetism is the basis for devices such as electric motors and electric generators.

The Left (or Right) Hand Rule (03:01)

When electric current flows in a wire there is a region of magnetic force which encircles the wire. The Right-Hand Rule and the Left-Hand Rule describe the direction of this magnetic force.

Electric Coils (02:46)

The potential for a magnetic field surrounding a current-carrying wire to do useful work increases greatly when that wire is bent into a simple coil. Properties and applications of magnetic coils are explored.

Solenoids (02:42)

A solenoid is a tightly-wound helix of current-carrying wire. Properties of solenoids, and their similarities to bar magnets, are examined.

Solenoid Switches (01:28)

One important use of a solenoid is as a mechanical switch which is turned on and off by electricity. The construction, function, and application of solenoids are explored.

Electromagnets (01:27)

Electromagnets are used in many practical everyday applications. The scientific principles which underlie the construction and function of electromagnets are explored.