Hydraulic analogy

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.

• 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.

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