Does A Plugged In Phone Charger Use Electricity. Cell Phones use approximately 2 to 6 watts when charging while a charger left plugged in without a phone will consume 01 to 05 of a watt. Any charger that is plugged in at the wall and not switched off at the socket will still use some electricity even if its not plugged into the device it is meant to charge.
So put very simply leaving your charged phone attached to the charger uses 10 times the energy that leaving the charger dangling would. Cell phone charger cords are an example of a cord that does draw power even when it is not plugged into the phone. In such a situation the charger will still draw a minimal current from the mains and the regulator will maintain a steady supply of 5 V.
Cell phones mobile phones even smart phones and tablets are very energy efficient because they are designed to run on a battery for a long period of time.
If it is warm it is likely using power. I wouldnt be surprised if all the adapters in a typical home add up to more than a few cents of power a month. According to my tests a genuine Apple iPhone charger uses in the region of 135W of power a month which equates to just over 15KW h a year which means that if. Some of the chargers likely use more power than others so the real cost to leave your smartphone charger plugged in for an entire year is probably below 13 cents.
