Status Updates From The Autobiography of Nikola...

To Szigety's amazement, he seized a stick and began to draw in the sand. Tesla had hit upon the design for an alternating-current motor in which rotating magnetic field produces the electrical charge in the motor, which in turn produces rotational torque that can be used to do useful work. "No more will men be slaves to hard tasks," he declared. "My motor will set them free, it will do the work of the world."

Mf tesla is a genius guy