Can you explain electrical circuits in terms of water flow analogy?

People compare circuits to water flow, but how do you explain that a circuit needs to be a closed loop for the electric charges to flow, but for water, it can simply crash down from a high place to a low place, like a waterfall, it does not need to circle back. Is there a flaw in the electrical current - water... show more People compare circuits to water flow, but how do you explain that a circuit needs to be a closed loop for the electric charges to flow, but for water, it can simply crash down from a high place to a low place, like a waterfall, it does not need to circle back. Is there a flaw in the electrical current - water analogy? How do you reconcile this?
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