spark plug


spark plug

noun

: a part of an engine that produces a spark that makes the fuel burn

Full Definition of SPARK PLUG

1
:  a part that fits into the cylinder head of an internal combustion engine and carries two electrodes separated by an air gap across which the current from the ignition system discharges to form the spark for combustion
2
:  one that initiates or gives impetus to an undertaking
spark·plug \ˈspärk-ˌpləg\ transitive verb

First Known Use of SPARK PLUG

1903

spark plug

noun    (Concise Encyclopedia)

Device that fits into the cylinder head of an internal-combustion engine and carries two electrodes separated by an air gap, across which current from a high-tension ignition system discharges, creating a spark and igniting the fuel. The electrodes and the insulator separating them must withstand high temperatures, as well as an electric stress of up to several thousand volts. Spark-gap length affects the energy of the spark, and the shape of the insulator affects the temperature of operation.

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