The potato - a source of EMF

... Data Handling Physics B (Advancing Physics) Brief: In this coursework I will need to do the following * Understand how the data came about * Analyse the given data using my knowledge of physics * Evaluate and draw conclusions from the graphs Investigating a Potato as a source of EMF. Introduction: In this coursework I will be investigating the EMF produced by a potato cell ("a potato cell" in the sense of an electrical device, not a cell from a potato.) The potato cell generates an "electromotive force" (EMF) by electrical reactions that take place between the chemicals inside the potato and the zinc electrode connected to it. But how does it work? The Zinc electrode reacts with the acid inside the potato and a transfer of electrons takes place between the zinc electrode and the acid. The zinc is oxidized to Zn2+ and the acid, whose active ingredient is positively charged hydrogen (H+), is reduced

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