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@telectrix getting a tad cranky at the ads?

To quote one of your own....

“Calm down! calm down!”


Kettle down? Gives you an excuse to drop in at nearest Mac’s, Starbucks or Costa on way to job.

On the 2kW v 3kW question. Who cares? The microwave would boil water a lot quicker at only 800W
 
which costs the most in leccy? a 2kW kettle or a 3kW kettle (to boil the same quantity of water) ? answers on a beermat.

The obvious answer is that they would cost the same but I think there would be a difference.

The difference would be incredibly small, but the 2kW kettle would, as far as I can see, assuming both are made of the same material and have the same thermal insulation properties, use fractionally more energy than the 3kW.

I think that as the 2kW kettle takes longer to boil the water more heat will be lost from that kettle, therfore more total energy input will be required.
 
I remember doing this (and getting it wrong) in Chemistry.
It takes x amount of energy to heat water by 1 degree.
It’s one of them constants.
The more energy you use, the quicker the water will heat, but at the end the same amount of energy is used.
 
I remember doing this (and getting it wrong) in Chemistry.
It takes x amount of energy to heat water by 1 degree.
It’s one of them constants.
The more energy you use, the quicker the water will heat, but at the end the same amount of energy is used.

This is correct if you make the assumption that once the heat energy has been transferred to the water it stays there, in other words no heat energy is lost to the atmosphere.
In reality some heat energy will be lost from the water whilst it is being heated.
 
Which ever you have got used to is the best... as you have to go back and re-boil , if you miss judge it.
( get distracted doing something else - Multi-tasking. )
--Slowest may be best if need excuse to brew proper tea for 5mins -- then boil more for coffees.
 

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