Due to the energy price, I measured some of the devices of mine and my friend. My friend's family has an Xbox. Xbox's stand-by (when switched off) power consumption is around 20W. This was unexpectedly high for me. It is equivalent to a bright LED light. My friend immediately uses the power on/off switch extension. If you have an Xbox, I also recommend using the on/off extension cable.
Mathematics, programming, and a little bit of my life.