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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CNNMoney's 317,000 figure includes how many jobs the Labor Department reported were created in February (219,000) and March (98,000). A White House spokesman said Trump is including all the job added in January as well (216,000). Trump was only in office for 11.5 days that month.