Electrons go with the flow

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You turn on a switch and the light switches on because electricity 'flows'. The usual perception is that this is like opening a faucet and the water starts to flow. But this analogy is misleading. The flow of water is determined by the theory of hydrodynamics, where the behavior of the fluid requires no knowledge of the movements of individual molecules.

from Latest Science News -- ScienceDaily https://ift.tt/2C3o53L

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