  We investigate the properties of non-rotating, electrically charged strange
quark stars in four-dimensional Einstein-Maxwell theory. For quark matter we
adopt the well-motivated quantum chromodynamics (QCD) equation-of-state, while
for the charge density we assume it is proportional to the mass density. The
system of coupled structure equations are integrated numerically, and we
compute the mass, the radius as well as the total electric charge of the stars.
Moreover, we perform a detailed numerical study of the effect of electric
charge using the interacting quark equation-of-state. We find that stars as
heavy as two solar masses can be supported, and that the highest radius and
highest mass of the stars increase with the charge density.
