[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?

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Answer 1

There is a thermometer that senses when the water has fully boiled away. The presence of water keeps the temperature at the boiling point. Once the water is gone the temperature rises, tripping the internal thermostat to switch from boil, to keep warm