In order for spark plugs to create a spark discharge, high voltage must be applied to their electrodes. Depending on the ignition system, this discharge voltage is over 30,000 volts.
Spark Factory - Ignition Coil
Ignition coils consist of two windings: a primary winding with a small number of turns (about 100) thick copper wire (about 0.6 mm2) and a secondary winding with several thousand turns of thin copper wire (about 0.1 mm2). Both windings are surrounded by lamellar iron cores. From the control device through the built-in high voltage module, the primary winding receives current from the battery (low voltage). As a result, an electromagnetic field arises, which excites the secondary winding. When the control unit interrupts this electrical circuit, the electromagnetic field also instantly disappears within a fraction of a second. After that, a voltage of up to 400 volts arises in the secondary winding, which generates a high voltage surge (induction) over 30,000 volts. Mondeo engines have electronic ignition systems with twin-spark ignition coils that, in four-cylinder engines, produce their ignition sparks in a 1-3-4-2 or 1-4-2-5-3-6 operating sequence in V6 engines.
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