Analogy of Water Flow to Electric Current

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“The water in resovoirs A and B stands at different heights. As long as this difference of level is maintained, water from B will flow through the pipe R to A. If by means of a pump P the level in B be kept constant, flow through R will also be maintained. Here, by means f the work expended on the pump, the level in the resovoir is kept constant; and in the corresponding case of the electric current...a constant difference of potential is maintanied.” -Hawkins, 1917

Source

Hawkins and Staff Hawkins Electrical Guide Number One (New York: Theo. Audel and Company, 1917) 28

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