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Wikipedia says: "The ohm is defined as the resistance between two points of a conductor when a constant potential difference of 1 volt, applied to these points, produces in the conductor a current of 1 ampere, the conductor not being the seat of any electromotive force."

Basically a lot of measurements are defined in terms of other measurements and it's hard to find a basis for any of them that isn't arbitrary; the important thing is how the different measurements relate to each other.

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16y ago

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