  This mini-review is intended as a short introduction to electron flow in
nanostructures. Its aim is to provide a brief overview of this topic for people
who are interested in the thermodynamics of quantum systems but know little
about nanostructures. We particularly emphasize devices that work in the
steady-state, such as simple thermoelectrics, but also mention cyclically
driven heat engines. We do not aim to be either complete or rigorous, but use a
few pages to outline some of the main ideas in the topic.
