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       xkcd - A Webcomic - Hydraulic Analogy (2571)
        
       Image:
       hydraulic_analogy.png
        
       Current (water) running through the water (wires) causes it to
       boil, increasing the pressure (voltage), but resisting (impeding)
       the flow of hydroelectricity (water currents). This is the basis
       for Ohm's law.
        
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