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As shaggy-haired carer Lou (Walliams) chats to Neighbours stalwart Harold Bishop (Ian Smith), his supposedly wheelchair bound charge Andy (Lucas) is seen having a shot on an arcade bike racing game.
He remarks: "It is interesting that biological tissues, which have been on earth for millions of years, utilize this same feature -- displaceable bound charge -- for generating unusually large electric fields.
This mechanical strain would induce piezoelectric bound charges (called polarization) resulting in a potential difference between the two electrodes.