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Most here know me as a critic of all analogies except the mathematical
analogy. However *this* analogy is, in my view, very misleading and ought
never to be used. Electrical capacity is *not* "How much charge a
capacitor can hold". It is a quotient of charge to potential. The ultimate
limit on what a capacitor can hold is *not* determined by its capacitance,
but by the breakdown properties of its dielectric, charge leakage, etc.
The water analogy to electrical capacitance would be something like (mass
of water in the bucket divided by level of the water in the bucket), at
least for a cylindrical bucket.