how does a larger gap between metals used in simple cell electrodes lead to higher voltage?

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“The voltage produced depends on the positions of the two metals in the reactivity series. The further away the metals are in the reactivity series, the larger will be the voltage.”

Edit: I don’t mean physical gap, I mean gap in terms of reactivity

In: Chemistry
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Not a physical gap. The separation in the list of reactivity (more cell potential really). If two metals are at the top and the bottom of the list, sparks. Next to each other, nada. Physical distance is irrelevant as long as there is a conductive path.

Battery voltage is determined by the chemical relation of the materials in the reactivity series. All alkaline batteries produce nominal 1.5V regardless of size or geometry, for example.