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How did the voltaic pile provide a continuous electric current?

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Cross-section diagram of an alkaline-manganese dioxide battery showing labeled internal components, including the steel-plated covers, cathode, anode gel, current collector, separator, steel can, and brass rivet. — battery Cutaway view of an alkaline–manganese dioxide power cell.

The voltaic pile, invented by Alessandro Volta in 1800, provided the first source of continuous electric current by utilizing chemical reactions to generate electromotive force.

The device consisted of alternating disks of two different metals—typically zinc and silver or copper—separated by paper or cloth soaked in an electrolyte, such as salt water or sodium hydroxide.1

This arrangement functions because the energy released by the difference in the binding of electrons between the two metals drives the flow of charge. By physically separating the chemical reactions and connecting them through the electrolyte, the pile creates a potential difference between the terminals. This setup allows for the continuous transport of charge, providing a reliable current that, unlike the Leyden jar, did not require recharging.21