  Detailed measurements of the electron performance of the ATLAS detector at
the LHC are reported, using decays of the Z, W and J/psi particles. Data
collected in 2010 at sqrt(s)=7 TeV are used, corresponding to an integrated
luminosity of almost 40 pb^-1. The inter-alignment of the inner detector and
the electromagnetic calorimeter, the determination of the electron energy scale
and resolution, and the performance in terms of response uniformity and
linearity are discussed. The electron identification, reconstruction and
trigger efficiencies, as well as the charge misidentification probability, are
also presented.
