Now for something completely different . . .
What Does Your Microwave Power Level Button Do?
Just like the knobs on your stove allow you to adjust the heat beneath your pots and pans, the power-level
button adjusts the temperature at which food cooks in your microwave.
“All microwaves default to cooking at full power [level 10]. However, the power-level button enables you to cook certain foods more gently,” explains Chen. “For most standard microwaves, the power-level function actually pauses the microwaves for short
periods of time to allow the food to cook at a slower rate. You can even hear the microwave’s magnetron switch on and off if you listen closely.”
Here’s how this works: “During this ‘off’ period, the residual heat that’s generated in your food from the full-power cooking continues cooking your food without the more intense direct microwave
heat,” says Chen. “This means that when you set your microwave to power level five, or 50% power, there are waves bouncing around inside only 50% of the time, allowing the food to cook more gently.”
She adds that microwaves that use inverter technology are the exception to this
rule.
https://www.rd.com/article/microwave-power-level-button