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A spark plug is a device, inserted into the combustion chamber of an
engine, containing a side electrode and insulated center electrode
spaced to provide a gap for firing an electrical spark to ignite
air-fuel mixtures.
The high-voltage burst from the coil via the distributor is received
at the spark plug's terminal and conducted down a center electrode
protected by a porcelain insulator. At the bottom of the plug, which
projects into the cylinder, the voltage must be powerful enough to
jump a gap between the center and side electrodes through a thick
atmosphere of fuel mixture. When the spark bridges the gap, it
ignites the fuel in the cylinder.
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