Something that I’ve noticed across most of the microwave ovens that I’ve used is that when they hum while cooking food, I can pick out 2 distinct tones. One of them is pretty clearly 60 120 hz, the 2nd harmonic of the AC power frequency. The other is consistently a minor 7th above that (which would be somewhere around 106-108 212-214 hz depending on the exact ratio). What causes this 2nd frequency to be produced?

Edit: after checking against a tone generator, the low frequency is actually 120 hz, double the grid frequency. The question is still the same, just an octave higher.

  • @HerrBeter
    link
    English
    5
    edit-2
    7 months ago

    Mashed potatoes :

    Dice small, 10-15min

    Rice:

    1,5dl water to 1dl rice, 10-12min

    I could go on. It’s a big water heater

    • @SpaceNoodle
      link
      English
      37 months ago

      Why have I not been microwaving rice? Does this affect the texture at all?

      • @HerrBeter
        link
        English
        17 months ago

        Only if you don’t turn down the power, you want full effect to get in to temp and then turn it down to keep temperature steady

          • @HerrBeter
            link
            English
            17 months ago

            I don’t think I specified, but much like cooking rice on a stove top you won’t run it at the same temperature. The microwave will use less energy than a traditional stove top, not sure about induction ones. And after learning to boil things with it, I do it all the time.

            Just get it to boiling then 450 then if needed 300

    • Clay_pidgin
      link
      fedilink
      English
      1
      edit-2
      7 months ago

      I’ve never seen someone use Deciliters before! Love it. Disclaimer: I live in either the USA, Myanmar, or Liberia.