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.
President Trump has now fired 3 officials who were investigating his campaign or administration. Be the first to know about new stories from PowerPost. Sign up to follow, and weâll e-mail you free updates as theyâre published. Youâll receive free e-mail news updates each time a new story is published.
Trump's cabinet nominees. President-elect Trump has about 4,000 government positions to fill, including some of the most important posts in the US government. He has focused on people with business, instead of government experience as he aims to make good on his promise to shake up Washington.