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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But the presidentâs firing of Mr. Comey was far more consequential, as Ms. Yates and Mr. Bharara both were holdovers, and might only have served in the Trump administration for a matter of days or weeks.