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Connect one end of a piece of wire to a battery terminal and the other end to the other terminal. The ends of the wire become oppositely charged and the electrons in the wire flow along it towards the positive terminal. This causes the chemicals in the battery to change and eventually they will all be changed and the battery will be flat. It will then be unable to keep the ends of the wire oppositely charged and the current will stop.

Or you could connect the wire to the terminals of a generator. The laws of magnetism will cause the generator - when it's turned - to charge the ends of the wire oppositely and a current will flow. But only while the generator is turning, because as soon as the electrons move down the wire they neutralise the charge, which must be replaced to keep the current flowing.

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