PASCO SE-8658A PERMANENT MAGNET MOTOR - Manual (Page 22)

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Permanent Magnet Motor 012-07210A
4. If you have a PASCO computer interface and Voltage Sensor, try this:
a) Predict how a graph of voltage versus time would look if you put the dual slip rings down and spun the
armature rapidly and let it slow to a stop.
b) What if the split rings were down?
c) What if the split rings were down, but you spun it in the opposite direction?
d) Test these predictions if the proper equipment is available.