A good rule of thumb is that the energy needs to go somewhere. So if the adapter was drawing a significant amount of power, it would get warm to the touch.
That’s how I found out that my desktop speakers consume power even with the physical button being off and status light dark. The power brick stays warm indefinitely, a good 20W feels like! I have to unplug that thing now when not in use. Any normal power brick will be <1W of course.
A good rule of thumb is that the energy needs to go somewhere. So if the adapter was drawing a significant amount of power, it would get warm to the touch.
That’s how I found out that my desktop speakers consume power even with the physical button being off and status light dark. The power brick stays warm indefinitely, a good 20W feels like! I have to unplug that thing now when not in use. Any normal power brick will be <1W of course.