Voltaic cell
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“Just as a head of water supplies a hydraulic pressure that causes the liquid to flow through a pipe in spite of friction, so there is an electrical pressure that forces a current through a conductor in spite of its resistance. The unit of electrical pressure is called the volt.” — Avery, 1895
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Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 443
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