Information on Paddle Wheel Flow Meters
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Since electric current is invisible and the processes at play in electronics are often difficult to understand in an intuitive way, it is common to teach electronics using analogies to more common sense objects and processes. Probably the most widely used analogy is made to a hydraulic system of water in pipes. The "electron fluid" in a metal conductor has many similarities to such a system, and the various electronic components have similar hydraulic equivalents.