  The directed transport of an overdamped Brownian motor moving in a spatially
periodic potential that lacks reflection symmetry (i.e. a ratchet potential) is
studied when driven by thermal and dichotomic nonequilibrium noise in the
presence of an external, constant load force. We consider both, the classical
and the quantum tunneling assisted regimes. The current-load characteristics
are investigated as a function of the system parameters like the load force,
the temperature and the amplitude strength of the applied two-state noise.
