The reversibility of electrical machines is caused by the same arrangement of converters of electrical energy into mechanical and mechanical into electrical energy. Thus, electrical machines are interchangeable: an electric motor can be used as a generator and vice versa, an electrodynamic head can be used as a microphone and vice versa, etc.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.