National High Magnetic Field Laboratory
Magnet Academy: Electromagnetic Induction
In 1831, Michael Faraday carried out numerous experiments to prove that electricity could be generated from magnetism. He not only demonstrated electromagnetic induction, but also developed a good conception of the processes involved....
National High Magnetic Field Laboratory
Magnet Academy: Electricity Meter
When electricity became available to the masses, utilities needed meters to record customer usage. This early 20th century model resembles many in use today. (Java tutorial)
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Magnet Academy: Mass Spectrometer (Dual Sector)
Mass spectrometers are machines that give scientists a look at the composition and origin of a material by analyzing and quantifying its atoms and molecules. This tutorial shows how a dual sector mass spectrometer works. (Java tutorial)
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Magnet Academy: Magnetic Domains
In ferromagnetic materials, smaller groups of atoms band together into areas called domains, in which all the electrons have the same magnetic orientation. That's why you can magnetize them. See how it works in this Java tutorial.
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Magnet Academy: Deionization
The magnets here at the lab can generate massive amounts of heat. To cool them off, we need massive amounts of water. But first, we have to take the ions out.
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Magnet Academy: Magnetic Field Around a Wire, Ii
A handful of iron filings helps visualize the invisible magnetic field that circulates around a wire with a current running through it. (Java tutorial)
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Magnet Academy: Leyden Jar
These devices, though quite humble, represented a tremendous breakthrough in the history of electricity; they were the first capacitors, and as such were able to store electric charge. (Java tutorial)
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Magnet Academy: Kelvin Water Dropper
The legendary Lord Kelvin made electricity from water with this ingenious electrostatic generator. (Java tutorial)
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Magnet Academy: Inductive Reactance
Like resistance, reactance slows an electrical current down. Explained by Lenz's Law, this phenomenon occurs only in AC circuits. (Java tutorial)
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Magnet Academy: Inductive Pendulum
Get the swing of electromagnetic induction with this simple tutorial. (Java tutorial)
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Magnet Academy: Induced Current
A current can be induced in a conducting loop if it is exposed to a changing magnetic field. (Java tutorial)
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Magnet Academy: Ignition Coil
Ladies and gentlemen, start your engines and learn about the ignition coil, a type of step-up transformer, key (no pun intended) to the operation of your car. (Java tutorial)
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Magnet Academy: Right and Left Hand Rules
No fancy movement in this tutorial, but these rules come in very handy when trying to understand some of what's going on in our other tutorials.
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Magnet Academy: Hall Effect
When a magnetic field is applied perpendicular to the flow of current, the field causes resistance in the current. This is the Lorentz force at work, and can be observed well in the Hall effect. (Java tutorial)
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Magnet Academy: Lissajous Figures on an Oscilloscope
This Java tutorial is a three-dimensional simulation of a cathode ray oscilloscope producing Lissajous figures as it compares sinusoidal voltages.
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Magnet Academy: Maglev Trains
Maglev trains are making history right now.
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Magnet Academy: Mirror Galvanometer
Invented by William Thomson (who later became Lord Kelvin for such clever acts as this), the mirror galvanometer was a useful instrument that played a key role in the history of the telegraph. (Java tutorial)
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Magnet Academy: Microwaves
What makes those kernels pop inside your microwave? A whole lot of water interacting with a whole lot of high-frequency electromagnetic waves. (Java tutorial)
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Magnet Academy: Magnetic Field Around a Wire, I
Whenever current travels through a conductor, a magnetic field is generated. (Java tutorial)
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Magnet Academy: Magnetic Shunt
Magnetic shunts are often used to adjust the amount of flux in the magnetic circuits found in most electrical motors. (Java tutorial)
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Magnet Academy: Magnetic Core Memory
Magnetic core memory was developed in the late 1940s and 1950s, and remained the primary way in which early computers read, wrote and stored data until RAM came along in the 1970s. (Java tutorial)
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Magnet Academy: Lorentz Force
Learn about the Lorentz force with the help of this tutorial, in which a wire fashioned into a pendulum moves inside a magnetic field. (Java tutorial)
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Magnet Academy: Lodge's Experiment
Sir Oliver Lodge's experiment demonstrating the first tunable radio receiver was an important stepping stone on the path toward the invention of a practical radio.
National High Magnetic Field Laboratory
Magnet Academy: Tape Recorder
Two heads - or even three - are better than one when it comes to understanding how tape recorders exploit electromagnetic induction. This is a Java tutorial that explains how tape recorders reproduce sound.