  In order to verify a possibility of a dc voltage predicted on segments of an
inhomogeneous superconducting loop the Little-Parks oscillations are
investigated on symmetrical and asymmetric Al loops. The amplitude of the
voltage oscillations $\Delta V$ measured on segments of symmetrical loop
increases with the measuring current $I_{m}$ and $\Delta V = 0$ at $I_{m}= 0$
in accordance with the classical Little-Parks experiment. Whereas the $\Delta
V$ measured on segments of asymmetric loop has a maximum value at $I_{m}= 0$.
The observation of the dc voltage at $I_{m}= 0$ means that one of the loop
segments is a dc power source and others is a load. The dc power can be induced
by both thermal fluctuation and a external electric noise.
