>>280794960>19th century EuropeExperts in chemistry, physics, math, engineering and such existed since the fucking Bronze Age
If that isekai world is so fucked that someone demonstrating how electricity (something everyone knows exists due to natural phenomena) works and can be controlled it must mean that nobody
1) learned how to control and manipulate fire, so no cooking
2) learned how to smelt and combine metals, so no swords
3) learned how to process minerals, so no paint
4) learned how to harvest and cross plant, so no agriculture
That's not an isekai, that's an alien civilization