How much power does this 61W power adapter consume the electricity, If I only left it plugged in the main but not plug in my MacBook?

I usually left my chargers plugged in the wall (main) when I left office, does it consume electricity in that condition? because I bring my MacBook home, and the charger is left plugged in the wall..

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  • It does not consume electricity with nothing plugged into it. The principle of conservation of energy tells you this. In order to consume power, it would have to be doing something, if only generating heat. The fact that it sits there doing nothing and not getting hot tells you it can't be using any electricity.

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