  We present the results of new experiments on the observation of the electric
response of superfluid helium (He II) at the excitation of second-sound waves
in it. We used an acoustic resonator with dielectric case, in which the
measurements of the electric and thermal signals were carried on simultaneously
due to the disposition of a measuring electrode and a bolometer on the face
wall. We measured the potential differences between the face electrodes, as
well as between ring metallic electrodes disposed along the resonator case
which were insulated from one another and from helium. It is shown that the
distribution of the electric potential along the resonator coincides with that
of the temperature in a standing second-sound wave. It is established that the
ratio {\Delta}T/{\Delta}U in a second-sound wave is a constant equal to
2.3{\cdot}10^(4) K/V in the whole regions of temperatures, frequencies, and
heat flow powers under study.
