Spark plug

A spark plug also known as a "sparking plug", is a device used in delivering the electric current to the air-fuel mixture in the combustion chamber in an internal combustion engine. It’s connected to the ignition coil and as the electricity flows through the coil, a voltage difference develops between the electrodes on the spark plug. This causes electricity to jump the gap, making a spark which ignites fuel.

Spark Plug Media

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  Sparkpluggauge

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  Longer insulator tip (in gray) for the "hotter" spark plug

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  Central and side electrodes

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  An electric spark being generated between the electrodes