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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Friday Talking Points [432] -- Trump Advisor Apologizes Without Getting Fired! [ Posted Friday, April 14th, 2017 â 17:52 PDT ] This week saw some history made in the Trump White House. For the first time (at least in our memory), a White House top aide actually apologized for saying something stupid.