According to definition, currents are charges in motion. Considering t
his, both the Ampere force law between current-carrying wires and the
Faraday induction law between a current-carrying wire and a conductor
show that the force between moving charges must be greater than that b
etween the same charges when at rest relative to each other, responsib
le for all phenomena of electrodynamics. The force between charges in
uniform relative motion is obtained, whose component perpendicular to
the relative velocity v of the charges is larger by a factor of 1/(1 -
v(2)/c(2)) than that between the same charges when at rest with respe
ct to one another. Two new effects implied by this force are presented
, whose empirical confirmation can in turn serve to support the theory
.