I'd actually be able to teach them how to make it if they have copper and magnets, since I know how to make a simple generator. They'd be SOL on how to use it though, because I don't know how to make something entirely from raw materials that would require electricity. Which means they also wouldn't know I am creating it with the generator... 🤔 Uh... Shit.
This is actually kinda wild to think about and I hadn't considered it before. Making electricity is easy! Using it is actually more complicated.
Making an "ouch" device or basic heater is something I could do.
Even a battery I could make a simple alumium air battery cell. Or lemon battery. But I'd be viewed like a sorcerer asking for foreign ingredients like salt, aluminum, copper and zinc.
Aluminum would be nearly impossible to obtain, it's actually my preferred grab in a hypothetical "You're going back in time and can take one thing" situation
Joe Rogan had a good line back before he became... whatever he is now. Anyways, the line is "if I dropped you off on a deserted island, how long before you could send me an email?"
Well you'd need to invent mining, metallurgy, machining, manufacturing, radio waves, computing, computer programming, electricity, and a slew of other technologies that took thousands of years and millions of people to create.
You can make a generator.. so then stretch wires to a distance and put a motor on the end of it (similar to the generator). Basically blow their minds in that you could transfer power over distance without a mechanical coupling.