exchemist
Valued Senior Member
Yes I expect the accuracy may not be down to the nearest 1p and if the true value is intermediate you will also get rounding errors. But evidently you are in the UK so 240V applies. Or 230V - seems there was some fudging done to achieve EU harmonisation some years ago, whereby the official nominal voltage in the UK dropped, at least on paper, from 240 to 230. I think the real voltage varies a bit: it's the frequency that has to be rock-solid, so voltage can be allowed to vary with load to some extent.Why am I making all this fuss over a kettle?
I'm checking my reckoning against the smart meter reading. Funny thing is the smart shows 2 pence and sometimes 3 pence a cup, even one of 1p.
And, I have to say, I wait a minute or two to watch it update the display after a cup has boiled. That's what started me on this trip.
I suppose the smart meter is not so punctual in updating the display, and when it does it picks a number out of the air between 1 and 3 ??? I suppose and hope a more 'accurate' usage reading is being sent to the electric company.
But in the UK your kettle won't be 250W, for sure. It will be 1kW +/- a few %.