An Induction Coil Or Spark Coil, Archaically Known As An Inductorium Or Ruhmkorff Coil Is A Type Of Electrical Transformer Used To Produce High-voltage Pulses From A Low-voltage Direct Current Supply. Stock
File:Ruhmkorff coil schematic 1.svg - Wikipedia
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File:Ruhmkorff coil.png - Wikimedia Commons
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