The biquaternionic form of motion equations of electro-gravimagnetic charges and currents under action of external EGM-fields
are considered. It is constructed in differential algebra of biquaternions by use biquaternionic generalization of Maxwell and
Dirac equations. The field’s analogue of the three Newton laws is presented. The energy-pulse biquaternion of interaction are
considered and the conditions of energy release, energy absorption and conservation are obtained.