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The coil has a primary winding of 1000 turns around an iron core and a secondary winding of 5500 turns. |
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The magnetic switch or interrupter is pictured to the left. Current flows through the primary winding via the point contact at the end of the left knob, magnetizing the iron core. The small piece of iron at the end of the narrow piece of spring steel is pulled to the core, breaking the current through the primary causing the magnetic field to decay, allowing the spring steel to return to its original position and start the process over again. |