  Vector and scalar potentials are used for convenience in solving boundary
value problems involving electromagnetic (EM) fields. The potentials are made
unique by choosing a non-unique gauge relationship. The most commonly used
gauges are those named for Lorenz and Coulomb, both of which may be defined as
special cases of what is termed the velocity gauge, or v-gauge. This
generalized gauge is not usually taught to students of electrodynamics. In this
paper, we review properties of the velocity gauge, including EM field
invariance, and demonstrate its application via an example.
