  Conservation of current and conservation of charge are nearly the same thing:
when enough is known about charge movement, conservation of current can be
derived from conservation of charge, in ideal dielectrics, for example.
Conservation of current is enforced implicitly in ideal dielectrics by theories
that conserve charge. But charge movement in real materials like semiconductors
or ionic solutions is never ideal. We present an apparently universal
derivation of conservation of current and advocate using that conservation law
explicitly as a distinct part of theories and calculations of charge movement
in complex fluids and environments. Classical models using ordinary
differential equations rarely satisfy conservation of current, including the
chemical kinetic models implementing the law of mass action and Markov models.
These models must be amended if they are to conserve current. Strict
enforcement of conservation of current is likely to aid numerical analysis by
preventing artifactual accumulation of charge.
