How many kilowatt hours does the fluorescent lamp marked with 220V 40W consume when it works normally for 5 hours?

How many kilowatt hours does the fluorescent lamp marked with 220V 40W consume when it works normally for 5 hours?

On the first floor, I forgot that the ballast of the fluorescent lamp also consumes electricity
The power consumption of ballast is 15% of lamp power. The actual power consumption of ballast depends on its quality
So 46 * 5 = 230wh = 0.23 degrees

The power of each fluorescent lamp in the classroom is 40W when it works. How long does one degree of power supply for all 10 fluorescent lamps in the classroom last

P=40w x 10=400w=0.4kw
t=W/p=1kw.h/0.4kw=2.5h

If the name plate of a 37 Inch LCD TV has the word "220 V 200 W", the TV will work normally and consume () kW · h electric energy

0.2 kW, that is, full load work, an hour consumption of 0.2 kwh

0.2 degree of electricity can make an electric kettle marked with "220 V, 2000 W" work normally___ hour

If it can work normally for X hours, then 2x = 0.2 (primary current is 1000W * h), then x = 0.1h (hour). So fill in 0.1 in brackets