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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Not counting Trumpâs nominees, only 39 of the 589 current and former Cabinet secretaries (7%) were businesspeople who came to their positions with no public-sector experience. More commonly, people have either come to public service after long business careers or have gone back and forth between the public and private sectors.