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 has long been dubbed a hair-raiser, as much for his famous catchphrase 'You're fired!' as his comb-over hairstyle, that for years has matched his bronzed complexion. But the 67-year-old American business magnate seems to finally be letting his natural grey roots shine through.