Answer:
For a circuit to work, it has to be complete, meaning it has to be in a complete loop from battery to component and back to battery again. A wire in a straight line won't do anything. This is similar to how most race tracks go in a circle, and the cars complete multiple laps.
If you take a normal, complete circuit and break the connection somewhere, for example by disconnecting one end of the battery, the flow of electricity will stop. This is called an open circuit. This is like blocking off the race track at a particular point, or redirecting the race track to a dead end.
I hope my answer was helpful for you...