There seems to be a little bit of a gap in your understanding of how electricity works.
As some have pointed out, the word "circuit" is important.
You can think of a wire carrying electricity like some sort of pipe carrying water. The current is equivalent to the water flow, a battery is equivalent to a water pump, the voltage is equivalent to the pump pressure, and the load (a motor, a light bulb, a led, anything) is kind of equivalent to a generator.
Imagine a closed water circuit. A pump "pushes" the water upwards, the water then falls down due to gravity and while falling down it moves a generator. The generator is slowing down the water (decreasing the pressure) and finally the water gets sucked by the pump.
The main thing that you have to understand in this case is that, if for some reason you want more water to go through the generator, the first thought is "I should increase the pump's power so the water can travel faster, thus carrying more volume of water per second", but then you realize "oh snap, the pipes are too thin, so if I increase the speed of the water, the walls of the pipes will drag it down, making it way more inefficient, and the pressure created in the pipes will be so high that they might break and start leaking". So you have to put wider pipes. This way when more water flows, the water speed can adjust normally without creating too much drag to the walls. A wider pipe can carry more water per second than a narrower pipe, at the same water speed.
Imagine now that someone asks "But should I make only the top pipes wider, or should I make also the bottom pipes wider?". well, it seems quite obvious, the same amount of water that is flowing at the topp will be flowing at the bottom. If you make the water go easy on the top but not the bottom, then the bottom part of the circuit would have to carry water faster so it can "drain" the top part, thus creating that same drag that I described before.
Electricity is just like this, Whatever amount of electricity goes out of a battery will come back at it. And this happens also for any load. Whatever amount of electricity (current) goes into a motor also comes out of it. The only difference before/after the motor is the voltage.
The same amount of water that goes into a water mill comes out of it. The only difference before/after the watermill is the water height.
Hopefully I explained it clearly and didn't confuse you even more.