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. Cell Phones use approximately 2 to 6 watts when charging, while a charger left plugged in without a phone will consume 0.1 to 0.5 of a watt. Charging an iphone or android phone under normal use conditions will typically cost under a dollar for a full year.
Click calculate to find the energy consumption of a cell phone charger using 5 Watts for 3 hours a day @ $0.10 per kWh.
Hours Used Per Day: Enter how many hours the device is being used on average per day, if the power consumption is lower than 1 hour per day enter as a decimal. (For example: 30 minutes per day is 0.5)
Power Use (Watts): Enter the average power consumption of the device in watts.
Price (kWh): Enter the cost you are paying on average per kilowatt hour, our caculators use the default value of 0.10 or 10 cents. To find an exact price check your electricity bill or take a look at Global Electricity Prices.
Charging a cell phone is not a very significant source of energy consumption. Unplugging your phone charger may save a little bit of energy, but even if you left a plugged in charger without a device which is consuming half a watt 24/7 for a full year, it will only cost you 44 cents a year @ 10 cents per kWh.
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