If i leave my charger plugged in and the switch is on without any device charging, does it ‘waste’ electricity? Why/why not?
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I feel like none of these are answering the question so I’m going to take a try.
If you imagine a charger as a person being awake and when it’s charging something he/she is talking to someone else, you could imagine it takes a lot of energy to talk to that other person. But how do you know if the other person is there? You need to stay awake, you need to let others know that you’re available, etc. There’s a lot going on to be idle. But even when you’re alone, there’s a voice in your head having a small conversation, transferring power (in our analogy). It transfers a lot less than when you’re talking with someone else but it’s still there and it’s always there. An adaptor works in kind of a similar way, no matter how perfectly we design it, there’s always going to be something to sense if something else is plugged in, and or there’s going to be leakage in imperfect parts.
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