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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RUBIO: Donald, you've hired a significant number of people from other countries to take jobs that Americans could have filled. You have brought over a thousand people from all over the world to fill maid jobs. TRUMP: As far as the people I've hired in Florida during the prime season, you could not get help. People didn't want to have part-time jobs. There were part-time jobs, very seasonal, 90-day jobs, 120-day jobs. I'm the only one on the stage that's hired people. You haven't hired anybody.