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Rice cookers--how do they know when to shut-off?

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My cuisinart rice cooker (love it!) will flip itself to "warm" when it's done cooking. I assume it somehows senses the moisture level and, when most of the moisture is gone, it decides it's done. Therefore, I assume if I want a relatively longer cook time, I need to add more water.

How does it know when to switch to warm?

~TDQ

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  1. My National probably has a bi metal switch I don't think it uses solid state electronics. It doesn't matter how much rice I am cooking nor does it matter how much water I have added, it takes a a little less than 20 minutes (somewhere between 17 and 19 minutes), always on after 15 minutes, always off after 20 minutes.

    Cook with two different amounts of water and time it.

    1. Well, timing it wouldn't be such a bad idea, and maybe I should do that, but, I swear when I've cooked a lot of wild rice, it takes "forever" sometimes 45-50 minutes, I'd guess, whereas oatmeal in the morning takes maybe 10-15 minutes--certainly not "forever" like the rice.

      The more I think about it, the more I think it seems like it has a spring and it could be deciding based on weight?

      ~TDQ

      2 Replies
      1. re: The Dairy Queen

        Oh, dear, sorry to bother y'all with this post. I just found this link: http://home.howstuffworks.com/questio...

        Basically, according to the info in the link, the rice cooker senses temperature. Boiling water maintains a constant temp; when all of the water is absorbed, the temp changes and that's when the rice cooker knows to shut off.

        ~TDQ

        1. re: The Dairy Queen

          The howstuffworks site is the best. Thanks for posting the link.