A lap
The state's prosecuting attorney in each judicial circuit is called the district attorney. The district attorney represents the government when it comes to criminal offenses.
67,000 miles an hour that's 30km a second.
Generally, a circuit with multiple paths is called "parallel" because of the structure of the wiring involved. Parallel circuits have identical voltage on all paths, while current through each path is variable; whereas series circuits, having only one path, has constant current, but variable voltage.
An electric circuit connected so that current passes through each circuit element in turn without branching.
Round Worms.
If your racing and betting on each others horses its called Racing for Pinks!
Circuit
Yes, when swimmers compete against each other they're called races.
An orbit.
The Referee (sometimes called "center ref") gives the commands to start and end each round of Taekwondo sparring when the time keeper indicates the round time has expired.
The current that flows from and back to the power supply in a parallel circuit is called the total current. It splits into different branches based on the resistance of each branch but remains constant throughout the circuit.
Parallel circuit