3 Home Devices That Barely Consume Any Energy


Knowing which home devices are top consumers of electricity is important: if you want to reduce your electric bill, that is where your focus should be. Devices such as air conditioners and electric resistance heaters should be used with moderation, unless you want to get a huge bill from your utility company!

There are also devices whose consumption is insignificant, and you can use them as needed without fear of a huge bill.

1) Cellphone Chargers

Cellphone chargers typically draw around 5 watts when charging a phone, and less than 1 watt when on stand-by. If we assume the cost of electricity to be $0.15/kWh, this is what it costs to charge your phone for one hour:

  • Energy = 0.005 kW x 1 hr = 0.005 kWh
  • Cost = 0.005 kWh x $0.15/kWh = $0.00075

Assume you charge your phone for 3 hours each day, for a total of 1,095/year. The total energy expense is... $0.82!

In other words, the power consumption of a cellphone charger is insignificant. Of course, it is still recommendable that you unplug it when not using it. The savings for you are negligible, but if everyone has the habit the environmental benefit adds up!


2) Laptop Computers

Depending on what programs you're running, a laptop computer can draw something in the range of 20 to 70 watts. How much you consume depends on what you're doing: typing a document in Microsoft Word is much less power-intensive than running a 25-player raid in World of Warcraft, to provide a drastic example.

Let's assume your laptop is your main tool for work, and you have it on for around 8 hours each day. With respect to power consumption, lets assume 40 watts. Having a laptop on for 2,300 hours/year is equivalent to:

  • Energy = 0.040 kW x 2,300 hr = 92 kWh
  • Cost = 92 kWh x $0.15/kWh = $13.8

$13.80/year is a very small expense, especially if we're talking about a tool that is often used for generating income. The cost of using a laptop computer is just slightly above one dollar per month.

3) LED Bulbs

An LED replacement for a 60-watt incandescent bulb only draws 10 watts of power, which represents 83% savings. If you have a 10-watt LED bulb and use it for 6 hours each day, you can expect the following yearly expense:

  • Energy = 0.010 kW x 6 hours x 365 days = 21.9 kWh
  • Cost = 21.9 kWh x $0.15/kWh = $3.29

$3.29 per year barely counts as an expense... this is why upgrading older light bulbs to LED is highly recommended. Just remember: there are many bulbs in a household and they add up. Even if they're LED, turn them off when not needed.


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