I'm going to have to comment, but both of you are partly right and partly wrong.Well no, because the kettle is a resistive load, therefore what will actually happen is it just won't give you 3kw on the 'foreign 230v' - it'll give you 2.75kw instead.
Much the same as adding resistance to a 12v/24v DC circuit will reduce the current. If you have a pull in coil with the output hooked to the starter input, it's plausible to burn that out that way - but more resistance leads to less current.
It's not a fixed power value, it's a fixed resistance.
It's no good using the right equation if you can't use it the right way around.
The point @Ubique was trying to make, was due to the coil being an inductive load, as voltage drops (or technically the back emf drops), the effective resistance also drops, resulting in a higher current.
The kettle analogy wasn't a good example, as it's a resistive load, but the figures are a reasonable example of how an inductive load might act, although in practise it's probably not going to a linear response (but at 240V vs 230V it's not likely to be that non-linear)