  We continue our studies of the evolution and cosmological consequences of
current-carrying cosmic string networks, described by a
charge-velocity-dependent one scale (CVOS) model. We present a detailed
calculation of the effects of these networks on the cosmic microwave background
(CMB), in the context of this model, and specifically discuss how such
current-carrying strings may be distinguished from their uncharged (Nambu-Goto)
counterparts by current or forthcoming CMB data. We find that, under the CVOS
hypothesis, the constraints on current-carrying strings should not differ much
from those of their structureless counterparts in that the impact on the CMB
can at most be reduced by a factor of ~25%. Nevertheless, the presence of a
current and charge affects the distribution of power among scalar, vector and
tensor modes, and also its distribution between small and large scales. It
should therefore be possible for future high-sensitivity CMB experiments to
distinguish between the two types of strings.
