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> I = U/R has no "maximum".
As an abstract equation, no.
In a real system, if you decrease R far enough, eventually U starts to
decrease too, in each a way that I remains fixed. Thus I has a "maximum
value".
Put simply, there is a limit to how fast the system can replace the
charge you're neutralising. It's no different than the fact that a water
pump has a maximum flow rate, no matter how slight the resistence of the
water pipes becomes.
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