... And what's with the negative comments from the others. ...I thought this site had class. ..
Arrogant demeaning sorts. And then a group that appear to be wantabees that enjoy a rat pack. Useless - annoyingly useless.
What exactly do you expect the students to do wirh this circuit?
Is there a lab book, a list of experiments?
How are the cubicles set up? Insulated benchtops?
I'd really recommend you answer in more than single short sentences. There is still not enough information to give you any help.
... I'm trying to keep contact voltage down when testing there projects . ...
I can't see that a series light bulb does that. If the leads are open-circuit, the voltage is still 120V.
The required available power (volts, amps) is dependent on what is required for the projects. Have you looked at the lab book to see what is required?
If you don't have one, maybe you should look for one. I would not recommend you set up the experiments unless you have a whole bunch of expertise in teaching the subject
So one more time. Students , voltage , safely .
Without more information - that is pretty useless. It's on you to tell us what you have in mind.
With no more than you have given us, I'd have to say, "Use batteries - nothing bigger than a few D cells or a 6V - 12V lantern battery
ice