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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Washington (CNN)Donald Trump's cabinet is attracting significant attention for lacking diversity reflective of the country he will preside over. Incoming White House Press Secretary Sean Spicer said Thursday that 5,000 appointed positions still needed to be filled and Americans could expect more diversity in those lower level appointments.