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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Even accounting for the growth of the Cabinet over time, Trump would be in the top tier in terms of the percentage of career businesspeople as Cabinet secretaries. A third of the department heads in the Trump administration (33%) will be people whose prior experience has been entirely in the public sector. Only three other presidents are in the same range: William McKinley (three out eight Cabinet positions, or 37.5%), Ronald Reagan (four out of 13 positions, or 31%), and Dwight Eisenhower (three out of 10 positions, or 30%).