Magnetism and electricity are not only related, they are two sides of the same coin, and it was the phenomenon of electromagnetic inductance, discovered independently by Henry and Faraday, that led to this realization. Electrons have spin, which gives each atom a small magnetic field. It's possible to induce the electrons inside certain metals to spin in the same direction, and that gives the metal magnetic properties. The list of metals that do this isn't long, but iron is one of them and, because steel is made from iron, it can also be magnetized. Ways to Make a Magnet.
You can increase the strength of the magnet by increasing the number of coils. 
For example, if you double the number of coils, you double the strength of the inductive field. However, when you increase the wire length to do this, you increase the electrical resistance, which lowers the amount of current flowing through the wire. Since current, which is the movement of electrons, creates the field, the inductive power goes down. Offset this current loss by increasing the voltage, either by changing the setting on the transformer or by using a larger battery.
Do you know how to build a small model magnetic generator? Find out how to build a small model magnetic generator in this article from HowStuffWorks. How to Build a Magnetic Generator. By HowStuffWorks.com Contributors Next. Place the magnet ¼ inch (.6 centimeters) from the head of the nail and move it rapidly from side to. Such a system consists of a number of components: The source for the spark, either electronic or mechanical (magneto) Distributor to direct the spark to the correct cylinder/plug. High tension leads to conduct the spark. Two spark plugs per cylinder which ignite the mixture.
Many people collect and restore old engines and in the process discover that the old iron magnets in the magneto have lost most or all of their magnetism. Without a healthy spark, the engine won't run. Here, Dave will show you how to build a device to recharge these old magnets. It's certainly not a novel invention.
What Dave has done is show you how to build a proven device from currently available materials, and at low cost. You can recharge old magneto magnets, and create new iron magnets for experimental purposes.
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This will not recharge newer alnico, samarium, and similar alloy magnets since these need an enormous magnetic impulse beyond the capabilities of this machine. And beside these newer magnets usually don't go 'dead' like 'plain' ones. Dave will show you how a magneto works, how to test one, how the magnetizer works and will show you in detail how to build one. He'll give you all the tricks on building the base, winding the coils, building and testing the power supply, and, of course, on using the machine.
You can build this machine quickly and inexpensively. Dave will show you how to avoid what few problems you might encounter. Great for engine restorers, science experimenters, or even as a science fair project.