It is simple as a Line-follower robot. If you saw those types of robot you will see there is a black line and the robot is walking or running on this line. The line is made in a loop. The robot can’t go without a loop. Electric current is like the robot it can’t go without wire or conductor.its mainly electrons in motion along a path regardlessly
of the number of electrons flowing. The path must be a circuit or copper, silver and aluminum. Free electrons can flow from start to end of the loop. Current is the rate at which an electric charge flows in a conductor. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionized gas (plasma).
It can be defined as one coulomb of electron or charge move one side to the other side. Electric current is widely used in household and industrial appliances.