Jim, There may a difference between you lab and a starter on a tractor. Yes, they are both series wound. Difference, the starter is under load and I question if your students have their motors under load. I've seen a series wound motor go into a self destruct mode when the load was removed. Self destruct mode is when the smoke comes out of the motor.
Do you teach your students the electron flow theory or the smoke theory? Under the smoke theory, when smoke comes out of any electrical device, it usually stops working. Therefore, smoke must be traveling in wires, not electrons :)
BTW, when you go past a power station, you can see the smoke coming out the chimney. They pump the smoke in the wires and when it comes back, the smoke released up the chimney. That's AC smoke Theory.
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