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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President Donald Trumpâs first job report beat expectations, with the economy adding 235,000 jobs in February and the unemployment rate ticking down to 4.7 percent. The jobs figure marks a slight dip from last monthâs report of 238,000 new jobs, but still represents a strong first showing for a president who has promised to add 25 million new jobs to the economy over the next decade.