hervit78 wrote:pollution from illuminated signs = estimated at 2 Tw / h in France (I put an H to please you) = 4 nuclear units
it doesn't make me happy! you don't seem to understand the difference between division and multiplication!
1 liter is a volume, 1 liter per second l / s is a flow: division
in electricity the W or KW is not an energy (comparable to the volume) but a power (rather comparable to the flow): it is therefore by multiplying the power by the time that one makes the energy in Wh (under heard multiplication between W and h (it's not my fault if the maths have a not clear notation
once we understand that the energy is in Wh we can always divide the energy by time to make the power: in Wh / h: and of course 1 Wh / h = 1W quite simply!
and 1 kWh / year is also a power more simply expressed in W after having calculated how many hours there are per year
(365 x 24) kWh / year = 1 kW
writing kW / h is a serious proof of incompetence: it is also a means of not marking in commercial documents figures without any value since this unit is absolutely impossible and meaningless!