I'm in year 10 (9th Grade for the Americans) and I just had a question about physics. How does a battery create potential difference? It it because the electrons are gaining energy as they get pulled further away from their atoms  or it is becuase of the concentration of delocalised electrons at the negative terminal?
I would like to know how potential difference is created between two points?Is potential difference created by adding more electrons at one side?If that's the case how to add more electrons at one side?  I'm really looking to know what really constitutes potential difference?
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