In this study we demonstrate the feasibility of generation of the electric charge and electric current in systems with rapidly varying parameters. It is shown that the electric current is excited spontaneously in the systems where electric resistance of their elements changes. Remarkably, effective damping resistance of the layered conductors may become negative, although ohmic resistance of its layers grows. Similar effects occur in electric circuits with different conductors connected in parallel. The effective resistance of such a system can decrease in spite of the increase of the ohmic resistance of the conductors. ©1997 American Institute of Physics.