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   NGK U2004 / 48012 Ignition Coil Genuine NGK Component. Essentially the operating principle is the same for all types of ignition coils? Whether the classic can-type coil, or in a coil rail system. The device contains two copper wire windings and a laminated iron core. The copper wires are insulated to prevent short circuits. The battery current fed through the primary winding produces a magnetic field whose strength is further increased by the iron core. When this circuit is opened, the magnetic field collapses, inducing a high voltage pulse in the secondary coil. The number of ...