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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Should all of President-elect Donald Trumpâs Cabinet nominees eventually be confirmed, he will start his administration with one of the most heavily business-oriented Cabinets in U.S. history. Five of the 15 people Trump has nominated to be Cabinet secretaries have spent all or nearly all their careers in the business world, with no significant public office or senior military service on their rÃ©sumÃ©s.