UK Cheap Motor Insurance Glossary
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Shock absorber
A device that converts motion into heat, usually by forcing oil through small internal passages in a tubular housing. Used primarily to dampen suspension oscillations, shock absorbers respond to motion; their effects, therefore, are most obvious in transient maneuvers.
Spark Plug
The spark plug converts high voltage energy into an arc that passes between its electrodes. The arc causes the gasoline-air mixture in the cylinder to ignite and expand, providing power by pushing down the piston.