So what you're saying is that (in units)
J = W.s
What happens when we divide both sides by the unit of time, in seconds?
J/s = W.s/s
J/s = W
Which looks alot to me like Watts = Joules per second...
This is a definition, pure and simple, and you agree.
I agree that it is silly to quote a light globe in terms of hp, but the fact is that joules are a measure of energy, be them electrical, mechanical, magnetic or any other form. While it is 'silly' it is not a wrong unit to rate the light bulb in hp.
Again, technically the kettle produces 2.4kW of energy which is 2400W or 2400 joules of energy a second. Again, an understanding of joules will tell you that this is the energy, which is pure and simple not related to turning, rotating, mechanical work, farting, or any other things that you assume must be electrical or mechanically related. It is a measure of energy pure and simple.
Yeah i know but mechanical engineer/law types like to argue.