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According to measurements from Lawrence Berkeley National Laboratory, the average cell phone draws 3.68 watts of power from the outlet while it's charging and 2.24 watts when charged.
You are charged per kilowatt hour for the energy that you use. The average residential customer uses somewhere between 500 and 100 kWh of electricity per month (although this varies depending on the time of year, the location of the home, and the size of the home).