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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18 People Who Are in Line For the Presidency If Trump Is Impeached. Vice President Mike Pence. Speaker of the House Paul Ryan. Senate President Pro Tempore Orrin Hatch. Secretary of State Rex Tillerson. Secretary of the Treasury Steven Mnuchin. Secretary of Defense James Mattis. Attorney General Jeff Sessions. Secretary of the Interior Ryan Zinke.