The invention relates to an electrical machine (8), especially a motor vehicle (2), comprising a rotor (22) which is connected to a hollow shaft (24) mounted such that it can rotate about an axis of rotation, and a rotary transformer (48) comprising a first slip ring (78) and a first brush (58) adjacent thereto. The first slip ring (78) is arranged inside the hollow shaft (24) and is connected thereto. The invention also relates to a motor vehicle (2) comprising a drive wheel (6) which is operatively connected to an electrical machine (8).