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[–] Acceletron 0 points 3 points (+3|-0) ago 

I can't explain it, but I learned most of my electrical knowledge based on this principle. I work with hydraulic and electrical systems all day. There is a mechanical water equivalent for just about every basic electric principle. Check valves for example function as hydraulic diodes.

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[–] Gringojones 0 points 1 point (+1|-0) ago 

Regulated valves act as transistors.