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How does a battery produce its potential difference (voltage)?
A battery stores energy chemically.
You have a part of the battery with an excess of electrons, and another part with a lack of electrons.
The excess electrons want to go to the other side (because like charges repel), and that generates a voltage.
If you complete the circuit and let the electrons go to the other side, the difference in number of electrons will go down and the remaining ones will want to move to the other side less (lower voltage).
Eventually the electrons are balanced, and the battery is dead, because it no longer has a potential difference
You have a part of the battery with an excess of electrons, and another part with a lack of electrons.
The excess electrons want to go to the other side (because like charges repel), and that generates a voltage.
If you complete the circuit and let the electrons go to the other side, the difference in number of electrons will go down and the remaining ones will want to move to the other side less (lower voltage).
Eventually the electrons are balanced, and the battery is dead, because it no longer has a potential difference