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 White House Who Have Left. 1  With the departure of Stephen K. Bannon, President Trumpâs chief strategist, five of the people in the swearing-in photo below no longer work in the White House. 2  Below are the top White House officials who resigned, or were fired, dismissed or reassigned.