spark plug

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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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    "Spark Plug" by Razor512 is licensed under CC BY.

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    References

     
    Merriam-Webster.com
         N.d.   Spark Plug. http://www.merriam-webster.com/dictionary/spark plug, accessed
             November 11, 2014.