Flow of electricty
It does not require flow to have power It requires flow to have Electricity.
If i pinch off the hose for the sprinkler the water is still in the hose. Yes, but not running water. you cut off its flow.
If i cut off the track behind the coaster the people are still in the car. Yes, but they are still going , you did not cut off their flow. There is track ahead of them and momentum or gravity forceing them on.
If i unplug the wire at the battery no electricity is in the wire. correct no "electricity" you cut off the flow of electrons, but there are still electrons in the copper atoms of the wire. You see electrons are electrons just like water drops are water drops. If you have a 1 drop open container and you add just 1 more drop, you now have running water. Your sprinkler hose can hold only so many drops of water if you add 1 more drop 1 has to come out the other end. Each copper atom in wire can only hold so many electrons. If you try to add 1 more electron one has to leave the wire. But since none can leave the wire none can enter either. So the extra electron is still at its source, the battery.