well, it does not really matter, although cold water in a kettle takes longer to boil
Well, the rhyme says, Polly put the kettle on, we'll all have tea, so there would have been water in the kettle.
The nursery rhyme character who put the kettle on is "Polly, put the kettle on."
The water which is hot rises to the top, and the cold water goes to the bottom to be heated. The heat transfers to the water, hence, making it hot. Then the hot water rises and the cold water goes down, then the heat transfers to the water and it carries on till all the water is fully heated.
polly put the kettle on because suki couldn't take it off if it was not on
cause you put it in cold water... so it makes it cold.
Polly put the kettle on. Polly put the kettle on. Polly put the kettle on and let's have tea. Sukey taken it off again. Sukey taken it off again. Sukey taken it off again. They're all gone away.
I recommend putting hot water in your kettle and timing it getting to the boil, and repeating with the same volume of cold water. Then have a think about why this happens.
The steam from a kettle will hit the cold window surface and lose heat rapidly, causing it to condense back into water droplets. This is because the cold window cools down the steam quickly, which is why you can see the steam forming water droplets on the window.
If you have a kettle, the more water you put in, the longer it takes.
Perhaps you can try descaling your kettle. You can either purchase a descaler or put 1/3 white vinegar + 2/3 water in the kettle and boil that. Leave the solution in the kettle overnight after boiling. The next day, dump out the vinegar solution and boil with just water. Leave that overnight and rinse out the kettle and you can use the kettle for making hot beverages now.
When using a kettle, it can be used for boiling water which has a number of uses. For instance use boiled hot water to cook pasta, make tea, speed up cooking time. A kettle can be used to clean utensils and kitchen equipment. And in those cold months a kettle can be used to melt ice from your car windscreen. There are a number of uses for your common kettle. Cleaning baby equipment and or making baby formula is another. But be carful with the kettle as it is full of steaming hot water.
As water at the bottom is heated, it rises and cold water replaces it. That's heated and the cycle continues until all the water is at the same temperature.