Automatic disconnection from the network when the consumer is disconnected

Question

Charger

I, like many, probably have a bunch of chargers for all sorts of gadgets that are piled up in one place. Here is the same for me. But it's not the mess that worries me, it's something else. All these charges are constantly connected to the network, i.e. always, day and night, and when there is no one at home and when nothing is charging. In this regard, I have two questions:
1. How much does an average charger, for example, for a smartphone, take in standby mode, i.e. when the phone is not connected to the charger, but the charger is plugged in?
2. Is it possible to automatically determine whether the charger is connected to charging or not? Certainly not visually. And if the charging is not connected, then automatically cut it off from the network.

Answer 1

Charging consumes mere pennies. Fractions of a watt. Dust on the refrigerator grate will give more consumption.
And in order to determine the connection of the device to the memory, it is necessary that the memory has an auxiliary source (battery or accumulator), with which it will be possible to determine that something has been connected. I have never seen such.