As an example, I wanted to use my phone. The charger uses 45watt. So if I charge my phone for arround 3 hours daily, which I think is normal for me, then I use 0.135kwh! (45 * 3 = 0.135).
With 0.135kwh, I could turn on my led stripes for arround 100+ hours!
Another example would be my car. If I drive 3 hours straight, it would use 720kwh, as it has 240+- kw.
The calculation for kwh is:
Watt x Hours