[ELI5] How does a rice cooker “know” the timing to switch from cook to warm when there’s no more water in it?

Question

[ELI5] How does a rice cooker “know” the timing to switch from cook to warm when there’s no more water in it?

In: 825

Answer 1

The most common temperature sensor is a common magnet. Once the water gets hot enough to boil, the energy being added starts to warm a magnet. That magnet will hold the switch in the “cook” position until it gets too hot and then the magnet weakens and the switch change to “warm”.