system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] What’s the most advanced technology that would still work in Hogwarts?

I’m guessing a smartphone wouldn’t, but what about a car, or a gun? Or a calculator (even a solar-powered one)?
gpt
We know that electricity is a strange Muggle technology, as even Arthur Weasley was unable to pronounce it. Candles light Hogwarts, with the closest thing to a lightbulb being the flashbulb on Colin Creevey's magic camera. 

We know that wizards/witches don't use guns, as Stan Shunpike explains on the Knight Bus in Harry's third year. Whether or not that's because wands are such a superior form of weaponry or because bullets wouldn't shoot straight in a magical environment is not explained. 

Cars work, or at least the flying Ford Anglia did.