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Ions in channels have been imagined as hard balls in a macroscopic mechanicalmodel, for a very long time. Hard balls interact by collisions in such models,randomly knocking each other on and off `binding' sites in thermal motion. Butions have large charge, and the hard balls of classical models do not. Theelectrodynamics of charge guarantee strong correlations between the movementsof ions on all time scales, even those of atomic scale thermal motion.Correlations are present whenever Maxwell's equations apply, so they arepresent in individual trajectories, not just averages. Indeed, in a seriessystem like an idealized narrow channel, the correlation is perfect (within theaccuracy of Maxwell's equations) because of conservation of total current (thatincludes Maxwell's displacement current, the ethereal ${\varepsilon}_0{\partial \boldsymbol{\mathrm{E}}}/{\partial t}$).The ethereal component ofcurrent prevents spatial variation of total current in a series system. Thestochastic complexity of spatial thermal motion disappears for current }in aseries system. Total current does not depend on location in a series systemlike a narrow ion channel on any time scale. Spatial variables are not neededin the description of total current in a one dimensional channel on any timescale, according to the Maxwell equations. Removing the spatial dependence oftotal current should dramatically simplify theories and simulations, one mightimagine.

Electrodynamics Correlates Knock-on and Knock-off: Current is Spatially Uniform in Ion Channels