Purpose:Demonstrate that a motor and a generator are the same.
Description:A pair of identical motor-generators are connected together. Cranking either one as a generator makes the other one rotate as a motor. Reversing the direction of cranking the generator reverses the direction of the motor.
This helps to illustrate the concept that motors and generators are basically the same apparatus used in different ways. Students may recognize this concept as it relates to ideas like regenerative braking.