A DC motor uses the split ring commutator. Turn on the power supply and start with a small push. Reversing the polarity of the power supply reverses the direction of the motor. The armature voltage can be seen on the meter.
An AC motor uses the double-ring commutator. Reversing the switch twice per rotation of the coil mimics an AC power source.
NOTE: Please avoid destruction of the coils by turning off the power supply when you are through.