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.
Credit Pete Marovich/Getty Images. 1  WASHINGTON â President Trump fired his acting attorney general on Monday night, removing her as the nationâs top law enforcement officer after she defiantly refused to defend his executive order closing the nationâs borders to refugees and people from predominantly Muslim countries.