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Car spark plug firing

Car spark plug firing

T860/0059

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Credit

DAMIEN LOVEGROVE / SCIENCE PHOTO LIBRARY DAMIEN LOVEGROVE / SCIENCE PHOTO LIBRARY

Caption

A car spark plug firing. Spark plugs are used in petrol engines to ignite a compressed fuel/air mixture in the combustion cylinders. This provides the force required to propel the car. A supply of electricity, normally at 6 or 12 volts, is fed via a distributor to an induction coil. There the voltage is stepped up to about 18,000V, enough to create a spark in the dense gas in the cylinder. At normal engine speeds, a spark plug may fire between 300 and 3,000 times each minute.

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