How can we say that the chemical action within a cell generates the potential difference across the terminals of the cell, even when no current is drawn from it?
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Well, the potential difference across the two terminals of the cell gets generated due to the chemical reactions which take place within it. This means that the reacting components are in contact with each other, thus the reaction keeps on taking place even when we don't connect the two ends. This is also the reason for the electric cell becoming unusable if we don't use it within an hour year or so.
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Answer: the chemical action within the cell generates pottential diff across the terminals of the cell
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