DIY Induction heating

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Once you have made your ignition coil, you may want to try making an induction heater. Here is how they work:

When an alternating electric current is passed through a coil, the coil creates a magnetic field. The magnetic lines of flux cut through the air around the coil. If a ferrous material, such a solid bar of iron is inserted into this coil, certain effects known as eddy currents are induced to flow in the metal bar. This causes localized heating, and ultimately heats up the metal bar.

How to make an induction heater.