First results from ATLAS experiment on production of $W$ and $Z$ bosons in proton-proton collisions at $sqrt{s}=7$~TeV

First results on $W$ and $Z$ bosons production cross-section at $sqrt{s}=7$~TeV obtained with ATLAS detector are presented. The measurements are performed in electron and muon channels, with data sample of around $320$~nb$^{-1}$ collected between March and July 2010. Methods of signal extraction and background estimation are briefly presented. The obtained results are in good agreement with theoretical predictions. Charge asymmetry of $W$ bosons is also presented.