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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.
1 Energy Charge-For the amount of electricity you use. 2  Electricity is measured in kilowatt-hours (kWh). 3  One kilowatt-hour is equal to the power used by 10 100-watt bulbs for one hour. 4  Customer Charge-A fixed charge that does not change with the amount of electricity you use.