Final answer:
The statement refers to the starting winding of a single-phase motor which is used to help start the motor by creating a rotational magnetic field.
Step-by-step explanation:
The definition "it's as if another stator winding has been placed at almost right angles to the run winding" refers to the creation of a starting winding in a single-phase motor. This additional winding is used to create a phase shift between the current in the main winding and the current in the starting winding, which generates a rotating magnetic field necessary to start the motor. The starting winding is typically energized only during the start-up of the motor, after which it is disconnected by a centrifugal switch or other device. The concept that the student's question touches on is fundamentally electromagnetic induction, which is a key principle in both motors and generators, as seen in figures depicting the operation of generators and motors in a uniform magnetic field. Motors and meters are examples of devices where electric current creates magnetic fields that produce rotational motion.