  The observations the dc voltage on asymmetric superconducting ring testify
that one of the ring segments is a dc power source. The persistent current
flows against the total electric field in this segment. This paradoxical
phenomenon is observed when the ring or its segments are switched between
superconducting and normal state by non-equilibrium noises. We demonstrate that
the dc voltage and the power increase with the number of the identical rings
connected in series. Large voltage and power sufficient for practical
application can be obtained in a system with a sufficiently large number of the
rings. We point to the possibility of using such a system for the observation
of the dc voltage above superconducting transition and in the asymmetric rings
made of normal metal.
