A spark plug has a metal threaded shell, electrically isolated from a central electrode by a porcelain insulator. The central electrode, which may contain a resistor, is connected by a heavily insulated wire to the output terminal of an ignition coil or magneto.
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More than 700 workers have left the rapidly shrinking Environmental Protection Agency since President Trump took office â including more than 200 scientists, according to a report. The exodus by staffers who have quit, retired or taken buyout packages includes 96 environmental protection specialists and nine department directors, according to the report by The New York Times and ProPublica.