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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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