A cordless phone will typically use between 2 and 3 watts of power per an hour both during active usage and when recharging. A cordless phone is typically left plugged in 24 hours a day, not much can be done to reduce the power consumption of your cordless home phone except limiting the number of phones you have. The good news is that cordless phones use very little power and are not a very significant factor of energy use in a typical home, just make sure your cordless phone is Energy Star rated as that indicates energy efficiency.
Click calculate to find the energy consumption of a cordless phone using 2 Watts for 24 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.
An older style phone that directly connects to phone line and has no power supply costs you nothing in electricity, because the power it receives is coming directly from the phone line and is normally not monitored or charged to the consumer.
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