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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A lot of comments here try to define the “waste” aspect of the question. For this purpose any energy used to not fulfill the devices primary function is wasted energy.
In chargers there are small buckets of magnetism. The magnetism is created by using electricity. But every bucket is not perfect – it has holes, so magnetism is leaking.
Additionally, there are other components used to keep filling the buckets that aren’t perfect either.
Buckets = coils.
For a more nuanced answer; the electricity is actually isn’t “wasted” if the temperature outside is couldn’t than inside. The energy becomes heat in a 1:1 ratio.
Now if it is hotter outside than inside and A/C is cooling the house, the charger and the A/C are in a fight. For every unit of heat the charger wastes the more the A/C has to counteract.
So in the winter time I see no problem, but at summer it can add up. Especially if you have a lot of devices in stand-by.
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