It's not really a mystery.links 'n stuffMy video on 240V power in the US;https://youtu.be/jMmUoZh3Hq4Technology Connections on Twitter:https://twitter.com/Te...
Think about this: your microwave and a kettle can pull the same 1500 watts from the outlet. A kettle can nearly directly put that energy into the water with its heating element, heating it. The microwave turns that energy into microwaves via a magnetron that then heats the water. The microwave also has a fan to cool its electronics, lest it overheats. That’s energy that isn’t going in the water, but is enough to damage things.
Now, why do you think a similarly powered microwave could beat an electric kettle?
This is the primary reason. The microwave is faster.
Think about this: your microwave and a kettle can pull the same 1500 watts from the outlet. A kettle can nearly directly put that energy into the water with its heating element, heating it. The microwave turns that energy into microwaves via a magnetron that then heats the water. The microwave also has a fan to cool its electronics, lest it overheats. That’s energy that isn’t going in the water, but is enough to damage things.
Now, why do you think a similarly powered microwave could beat an electric kettle?
Also temperature is a state function. It doesn’t matter how you get it.