Leon Mika

Before I left for Canberra, I handed my broken kettle lid to my dad who offered to repair it. I haven’t got it back yet so this past evening I’ve been using my kettle without one. And I can now tell you what happens when you do: it doesn’t shut off. The water starts boiling and will continue to boil until I manually cut the power (it’s one of those kettles which an induction coil so it’s just a matter of lifting it off the base).

I looked into it and apparently a typical kettle has a bimetallic strip¹ which is heated by the steam. This strip doesn’t require a lot of stream before it deflects due to thermal expansion, and when it does deflect, the power is cut. I guess it requires a relatively closed chamber to be effective, and having such a huge gaping hole at the top makes this completely ineffective. It’s probable it would shut itself off eventually, but that’s an experiment I didn’t want to make.

Anyway, the lid is ready and I’ll be picking it up today.