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In an internal combustion engine, the spark plug is a small device that produces electric sparks when the ignition key is turned. The electric sparks ignite the air/fuel combination in the combustion chamber, initiating the combustive force that powers the engine.
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Merriam-Webster.com
N.d. Spark Plug. http://www.merriam-webster.com/dictionary/spark plug, accessed
November 11, 2014.