[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

[obligatory technology connections video](https://youtu.be/RSTNhvDGbYI)
Tldr is that when you boil water it won’t exceed 100c at sea level. Cos all the energy goes into making the steam. Coincidentally there are magnets that reduce their strength at just over 100c. The magnet holds a contact closed allowing the cooker to heat. Whilst there’s still liquid water it won’t exceed 100c. Once all that water evaporates or is absorbed into the rice the heat rises to the temp the magnet becomes weaker (the curie temperature) the magnet looses strength and then disconnects the heater