Motor (English: Electric machinery, commonly known as "motor") refers to according to the law of electromagnetic induction electrical power conversion or transfer of an electromagnetic device. In the circuit

With the letter M (old standards with D) said. Its main function is to produce drive torque, as with all electrical appliances or mechanical power. The generator in circuit with the letter G

Said. Its main function is to use mechanical energy into electrical energy, is the most commonly used at present, using heat, hydro generator rotor to generate electricity.