Garry Edwards , Jul 19, 2004; 10:16 a.m.
A monolight is a single strobe in which everything is contained in the same unit, i.e. all the 'works' are included along with the flash tube.
A powerpack, or generator pack, is completely different, all the 'works' are in a separate floor-mounted unit, connected by cable to a lamphead that contains only the flash tube, modelling lamp and (sometimes) a cooling fan. Scroll down and look at this week's Weekly Lighting Theme.