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Hydraulic analogy

 
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There is a close analogy between electric current and hydraulic current if you consider the electric voltage (potential difference) as a height (altitude difference), and if you neglect all possible extraneous effects. The current goes down the potential differences  as the water goes down the altitude differences. This is a graphic illustration of the current/voltage convention in electronics.

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  • To illustrate the analogy between electrical current ant hydraulic current.
  • To introduce the current/voltage convention according to which current is regarded as being positive as it descends through potentials/altitudes.