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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Trump also lags in confirmations for those that do need Senate approval. 1  Washington (CNN)Nearly 2,000 appointed positions in the administration of President Donald Trump remain vacant, leaving many agencies with large staffing gaps waiting to be filled, according to data reviewed by CNN.