  A simple collisional three-component plasma model consisting of electrons,
ions, and neutrals with arbitrary collision frequencies and dynamic time scales
is considered. It is shown that the usual MHD-approach dealing with magnetic
field perturbations can give other results than the approach in which all
perturbations are expressed via the perturbed electric field. For the partially
ionized plasma with strong collisional coupling of neutrals with ions,
magnetosonic (nondamping) and Alfv\'{e}n (weakly damping) waves modified by the
presence of neutrals are obtained. It is shown that the magnetic diffusivity
for Alfv\'{e}n waves appears only due to the longitudinal current connected
with the field $E_{1z}$ at the angular propagation of perturbations relatively
to the background magnetic field.
  The model can be applied to different parts of a solar atmosphere and
prominences.
