Bruh why is school so long istg i should have retired from school in the 6th grade

What is the name of the device that senses the current flowing,tripping the circut,and cutting off the electricity

Answer these and you will be marked this is for 20 points

Asubstitute is standing at the halfway line waiting to enter the match at the next stoppage of play the ball has gone over the touchline for throwing and referee allows for the substitution to substitute wants to take the throw-in does the substitute first have to enter the field of play before being allowed to take the throw-in