Final answer:
The statement about the resistance split phase motor being reversing is true, as reversing the winding connections changes the motor's direction. Additionally, back emf is an important concept related to motor operation and efficiency.
Step-by-step explanation:
The statement 'The resistance split phase motor is a reversing motor' is true. Resistance split phase motors, also known as split phase induction motors, are commonly used in applications where a reversing feature is needed. The main characteristic of a resistance split phase motor is that it has two windings: a start winding, which is made of thinner wire and higher resistance, and a run winding, which has thicker wire and lower resistance. By reversing the connections to these windings, the direction of the magnetic field produced by the windings can be changed, which in turn reverses the motor's direction.
In general, any rotating coil in a motor will generate a back electromotive force (back emf), which opposes the input voltage to the motor. As the motor speeds up, the back emf increases until it almost equals the supply voltage at full speed. This is critical for understanding motor control and efficiency.