I bought a several dozen toy motors off somewhere cheap (~$20), soldered a couple of wires to the terminals, then handled that to the kids with a AA battery. T

I bought a several dozen toy motors off somewhere cheap (~$20), soldered a couple of wires to the terminals, then handled that to the kids with a AA battery. They were able to make the circuit and see something move, and you can talk a little about how a circuits or a motor work, then pivot to how Engineering is about "making things", and this is part of it. That worked for several classes of 3-6 grade.