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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âThere wasnât one good thing that came out of that administration or her being secretary of state.â Trump fired back Wednesday in an interview with NBC Newsâ Katy Tur. âHillary Clinton was the worst secretary of state in the history of the United States,â he said.