An electrical appliance with a resonant motor (10) for driving a vibratory component is provided that has a control unit for driving the resonant motor (10) with a predetermined driving frequency and for measuring at a predetermined time of measurement (tm) within a driving cycle the motion-induced voltage of the resonant motor (10) and for determining whether the measured voltage value coincides with a predetermined target voltage value or whether the measured voltage value has crossed over the predetermined target value.
