Ampère's circuital law

Ampere's Circuital Law is like a rule for electricity. It says that for an electrical current flowing through a closed path (or "circuit"), the total amount of electric current is equal to the amount of electric current that leaves the starting point and returns to the same point after going around the closed path. To put it another way, the total amount of current that goes into the path is equal to the total amount of current that comes out of it.