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| Keywords: Ruhmkorff inductor schem.svg Induction coil Ruhmkorff coil circuit to generate high voltages The induction coil consists of a primary winding A of relatively few turns of coarse insulated wire and a secondary winding B of many turns of fine wire wrapped around an iron core C The battery G sends a DC current through the primary winding The interrupter E is pair of vibrating switch contacts which repeatedly breaks the primary current creating flux changes in the coil needed to induce a high voltage in the secondary coil The interrupter has an iron armature piece on a springy arm next to the coil's core When the current is switched on it creates a magnetic field in the iron core The iron interrupter arm is attracted to the core opening the contacts The primary current to the core is cut off the magnetic field collapses and the interrupter arm springs back closing the contacts again The primary current turns on again and the magnetic field attracts the arm again This cycle repeats rapidly 20 - 40 times per second Each time the primary current breaks and the magnetic field collapses it induces a voltage in the secondary winding Since the secondary winding has many turns the voltage is large large enough to cause a spark to jump across the spark gap H Small induction coils can create a 1 - 2 inch spark 40 to 80 thousand volts while large coils can can create sparks up to 40 inches about 1 million volts own based on File Ruhmkorffinductor svg public domain work of PieterJanR 2009-01-15 PieterJanR and Tescobar Ruhmkorff coil schematic 1 svg SVG electrical diagrams Induction coils | ||||
