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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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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