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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Recent polls show that anywhere between 43 and 56 percent of Americans disapprove of President Trumpâs job performance. Even if you take the low end of that range, Trumpâs numbers are much worse than any past president a month into his term.1.