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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Will Trump Be Impeached Or Resign? Democrat Majority In House Could Oust President In 30 Days. President Donald Trump has been at the receiving end of sharp criticism â over his healthcare bill, immigration orders, and most recently rollback of climate change policies â since he took office in January this year. A supporter of the president, however, said Trump may be ousted from office, as early as 2018.