  The biquaternion approach is developed for building of the equations of the
inter-action of different charges and currents and generated
Electro-GravyMagnetic fields. The field analogues of three Newton's laws are
offered free and interacting charge-currents, as well as total field of
interaction. An invariance of the equations for one EGM-field model at Lorenz
transformation is investigated, and, in particu-lar, law of the conservation of
the charge-current. It is shown that at interaction by fields, this law differs
from the well-known one. So for closing the equation of charge-currents
transformations the new modification of Maxwell's equations is offered with
entering the scalar field of resistance in the biquaternion of EGM-field
tension. Relativistic formula for transformation of density of the masses and
charge, current, forces and their powers are built.
