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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Donald Trump, who set up his account on 18 March 2009, has sent a total of 32,697 tweets, almost five times as many tweets as Hillary Clinton, who only joined four years later, on 9 April 2013, after leaving the State Department.