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 came under fire in February for the chaotic rollout of his travel ban and for his team's shadowy dealings with Russia. But Fridayâs jobs report and other surveys suggest employers are looking past the mayhem.