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Description
Beginning with lodestones and ending with MagLev trains, this program introduces viewers to magnetic theory, magnetic fields and poles, the Earth as a magnet, electromagnets and electric motors, and magnets in everyday life. Experiments, animated graphics, and footage of applied magnetism are used to reinforce these essential scientific concepts.
Description
This program explores basic electricity as it was perceived by Benjamin Franklin and other early theorists, as well as the principles of positive and negative charge, conduction and induction, atoms and electrons, and elementary charge. Coulomb's Law is related in detail, including the torsion balance experiment that led to the breakthrough. Insulators, semiconductors, and superconductors are also explained and demonstrated. Specific modules include...
Description
This lively program presents the 1998 Faraday Lecture, which explains how the discovery of the electron by J.J. Thomson profoundly impacted both everyday life and scientific innovation. Combining stimulating on-stage experiments, computer graphics, interviews, and even a visit to CERN, the European Laboratory for Particle Physics, the program illustrates the principles of electrostatics and electromagnetism, examines the workings of the cathode ray...
Description
What are electromagnetic waves and how was it discovered that light is made of them? How were all the electromagnetic waves (like radio waves) that we can't even see discovered? And how do these electromagnetic waves affect our lives? In this exceptional program, science teacher Spiro Liacos introduces students to waves in general, and then takes a detailed and entertaining look at radio waves, microwaves, infrared light, visible light, ultraviolet...
Description
Not if, but when. Anyone who spends much time thinking about nuclear terrorism can whip up countless diabolical scenarios: entire cities vaporized and millions of people eliminated without a trace. Now imagine something equally chilling. Picture an instantaneous deathblow to the vital engines that power our society - delivered by a weapon specifically designed not to kill humans, but to kill electronics. It's called a high-altitude electromagnetic...
Description
We can scarcely imagine a world devoid of electricity, but today's power grids and high-tech home appliances would never have come to pass without the bold experiments of one ambitious Englishman. This program illustrates the life and accomplishments of Michael Faraday, a self-educated member of the Georgian-era working class who made groundbreaking discoveries about electromagnetism and became a world-famous scientist. Beginning with his birth in...
Description
Using engaging animation sequences to demonstrate core concepts, this program looks at the origins and development of our knowledge of direct current electricity. The video begins with the first uses of static electricity by the Greeks, then guides viewers through discoveries made by William Gilbert, Luigi Galvani, Alessandro Volta, and others during subsequent centuries. Students will gain an understanding of the chemical battery, the "complete"...
9) DC motors
Description
Showing how interactions between magnetic fields lead to the production of motion, this program introduces viewers to the inner workings of DC motors. Topics include the work of Hans Christian Oersted, the creation of the first electric motor by Michael Faraday, and the rules for predicting field direction and forces on current carriers. The construction of a simple DC electric motor is shown with helpful graphics and 3-D animation sequences explaining...
10) Ohm's law
Description
This program investigates the application and limitations of Ohm's Law. Series circuits and parallel circuits are described. Using equivalent resistance, practical exercises are developed in the application of Ohm's Law to series circuits, parallel circuits, and circuits of greater complexity. Specific modules include Ohm's Law, Series Circuits, Series Calculations, Parallel Circuits, Parallel Calculations, and Complex Circuits. Correlates to all...
11) Electric Motors
Description
This program explores the basic principles behind the operation of AC and DC motors. An explanation is given about how one or more fixed magnets, either permanent or electromagnetic, can cause linear movement or rotation of a current-carrying wire. A hand rule is developed to predict motor force. Motor torque is explained as a prelude to the practical design of a direct current motor. Specific modules include Motors and Magnets, Current and Magnet...
Description
This program traces the relationship between magnetism and electricity from the first accidental discovery of induced current. The concepts of electric and magnetic fields are introduced and their representation explored. The features of coils and solenoids are examined to develop the construction of practical electromechanical devices such as solenoid switches and electromagnets. Hand rules are introduced to help determine the alignment of currents...
Description
This Science Screen Report studies the physical force known as electromagnetism and how it encircles, interacts with, and is generated by matter. Demonstrating attractive and repulsive forces with iron filings suspended in liquid, the program explains the significance of a magnet's poles and why some materials are more magnetic than others. The electromagnetic fields of the Earth and Sun are also explored, with attention to magnetism's role in animal...
Description
Physics is a science that describes how things work. With the use of practical demonstrations related to common activities, this program investigates some of the key concepts of physics. Using a drum kit we look at how sound works, how we make it, and how it moves. We investigate electricity and electromagnetism and compare the similarities between a remote control car and a mobile phone charger. Finally, we take a look at radioactivity and discover...
Description
This program defines electric power and explores in general terms a variety of means by which it is produced, transmitted, and consumed. Efficiencies and inefficiencies relating to energy conservation are discussed in relation to power production, transmission, and consumption, with a particular focus on the efficiencies and inefficiencies associated with the conversion of electricity to light. Specific modules include Efficiency I: Power Production;...
Description
This program looks at physics principles behind AC and DC generators. The relationship between a changing magnetic field and the induction of electric current is examined. A hand rule is introduced to predict the generator effect in a linear length of conductor exposed to a changing magnetic field. The behavior of a rotating coil in a magnetic field leads to the practical construction of an AC motor. Split-ring commutator generators are introduced,...
Description
What's 7 feet tall, 14 feet wide and weighs one hundred and twenty five tons? It's a giant magnet, one of the largest ever built, and there's 7 of them. The magnets are part of a huge global project involving 35 nations and billions of dollars - all to reproduce the sun's boundless energy.
Description
A maglev train hovers above its track. A doctor uses an MRI scanner to detect disease. Fast digital circuits send superfast, clear signals from one source to another. These technologies are possible thanks to superconductors. Superconductors are materials where electrons can move without any resistance. But today's superconductors don't work unless they are cooled to well below room temperature. Now researchers are using quantum physics on a quest...
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