gentlegreen
I hummus, therefore I am ...
I once annoyed a physics tutor by pointing out that kettles made a noise and were also 50Hz radio transmitters - albeit ridiculously ineffective onesPlus the thermal mass of the kettle which will be quite small you'd think (as opposed to my metal whistling kettle). Your figures did look right when I checked them (for what that's worth ).
Yes I ought to weigh the kettle ..