This was both fun an interesting, but I would beg you to please accept alternates for "hob" like "burner" or "heating element" or "cooktop". https://en.wikipedia.org/wiki/Cooktop . This is especially poignant given the clue is leading you towards "heating element", and yet it's not accepted, while just typing "coffee" will get you "coffee jug".
I made this quiz in about five minutes as an antidote to the stereotypical Jetpunk quiz. So yes, it's a very broad question, but in the context I don't think it matters that much. I don't want anyone to take this quiz too seriously, seeing as I sort've wrote it as a joke.