What happens when you leave your charger on after your phone is charged completely?

Hey guys,
It's very common that we forget to switch off the main supply when our phone is charged.We leave it on.Now the question is whether there is any power consumption.Theoritically if there is no load there should be no power consumption.But still the charger consumes very minimum amount of energy because the primary winding of the transformer consumes electricity and this is the reason why the charger gets heated after some time.So if this thing happens for few times it's ok but if it is kept on for larger period of time then power consumed is considerable.So make it a habit to turn the mains off once your phone or laptop is charged up.
Thanks...

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Sci-fi WH

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