A.) Three resistors, 31 ?, 34 ?, and 68 ?, are connected in series, and a 0.62-A current passes through them. What are
(a) the equivalent resistance and
(b) the potential difference across this equivalent resistance?
B.) The current in a series circuit is 18.9 A. When an additional 11.4-? resistor is inserted in series, the current drops to 10.4 A. What is the resistance in the original circuit?