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If I charge my phone (or laptop), then disconnect the phone, but leave the charger itself plugged in, roughly how much money does it actually cost me (per day/hour/whatever)?

It's said that you should unplug your laptop and phone chargers when not in use, as they still use some electricity even when not connected to the device itself. My question is, where does this energy go? Is it actually leaking out as heat into the surrounding air, or is it whizzing around the...