A spark plug is a electronic device which is used to initiate the spark on the air+fuel mixture.The spark initiated by the spark plug is used to initiate the combustion so that the piston moves up and down,causing a reciprocating movement.In case of diesel engines spark plugs are not present as they work on compression ignition.Spark plug is an essential device in case of petrol engines.
FIG 1.0 SPARK PLUG
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