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 picks: here are all of the appointments so far. From ExxonMobil chairman Rex Tillerson leading the state department to Steve Bannon as chief strategist, hereâs who Trump has appointed so far. This article is 3 months old.