Abstract
Quantum equations describing a moving charged quantum particle are derived. The electric nature is described by the current and charge densities, J→ and ρ; and the quantum nature by the particle mass, wavefunctions, ψ→ and ψ0. The vector wavefunction, ψ→ is found to act along the current direction. The energy of the matter fields concomitant with a particle is found to flow along the current direction. A fluid with a stationary mass density inherently exhibits a Thomas precession.