There is such thing as power strips—you know, the things that allow you to plug in like 5 appliances or more into on long strip—which are “intelligent.” They “know” how to tell if the devices that are plugged into them are being used or not; and when the device finds that the stuff plugged into it isn’t being used, it simply turns itself off (so power is no longer sent to the devices, which can still use electricity when they are in standby more)… also similar to this would be a light that can tell if there is anyone in the room or not by using motion sensors.
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