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Appliance Energy Usage: An Overview

Updated on May 30, 2012
Source
Average energy use per U.S. household
Average energy use per U.S. household | Source

From washers and dryers to home entertainment to the devices we use for cooking and cleaning, our household appliances are an indispensable part of daily life. However, these modern conveniences come at a cost - both to our wallets and to the environment.

Home appliances, not counting air-conditioning units, are responsible for about 28% of a typical U.S. household's total energy bill, with heating, cooling, lighting, and water heating comprising the rest. In total, that adds up to 386 billion kilowatt-hours of residential power usage per year in the United States and emitting 264 million tons of CO2.

While major appliances such as dishwashers and clothes dryers can use a lot of power for short durations, the power consumed by small items like phone chargers, computers, and coffee makers can add up as well - often when they're not being used. However, choosing energy-efficient appliances and using our appliances wisely can both reduce our carbon footprint and our electric bills.

Power use of household items

Appliance
Wattage
Ceiling Fan
65-175 W
Dishwasher
1,200-2,400 W
Clothes Washer
350-500 W
Clothes Dryer
1,800-5,000 W
Microwave Oven
750-1,100 W
Refrigerator
725 W
Desktop Computer
60-270 W
Laptop Computer
50 W
Toaster
800-1,400 W
Coffee Maker
900-1,200 W
Flat-Screen TV
120 W
40 Gal. Water Heater
4,500-5,500 W
Hair Dryer
1,200-1,875 W
Source: http://www.energysavers.gov

Calculating Your Energy Usage

Figuring out how much power your appliances and devices use can seem daunting, but it can easily be determined with a bit of research and some simple math. Most appliances sold in the United States will have their energy use, or wattage, stamped on the back, bottom, or inside the door.

Since power utilities measure energy use in kilowatt-hours (kWh), we can multiply the wattage of an appliance by the estimated number of hours it is used per month to calculate the monthly watt-hours. Dividing by 1,000, we then arrive at the number of kilowatt-hours for an appliance.

As an example, we will use a clothes washer using 400 watts of power that (for simplicity's sake), has wash cycles of exactly an hour. If we do eight loads of laundry per week, that adds up to 3,200 watts used. In a month, that's 12,800 watt-hours or 12.8 kWh. With an average energy cost of nearly $.13 per kilowatt-hour (as of February 2012), that's $1.66 spent on washing clothes.

Washing machines are relatively light consumers of power. Dryers, on the other hand, are energy hogs. A 4,500-watt dryer that dries the laundry loads above in one-hour cycles will use 36 kilowatts of power weekly, 144 kWh monthly, and cost $18.72 per month.

Fortunately, most household appliances are not in constant usage, but are only used for short periods at a time. However, our appliances are often still consuming power even when we're not using them.

Unplugging your set-top cable box when not in use can save as much as $30 per year in energy costs. If the cat lets you, that is.
Unplugging your set-top cable box when not in use can save as much as $30 per year in energy costs. If the cat lets you, that is. | Source

Phantom Load: The Ghost in Your Machines

Standby power, also known by the far more creative names phantom load and vampire power, is the power drawn by an electronic device or appliance when not in use. From the LED on a toaster to a plugged-in phone charger to the blinking 12:00 on the DVD player, these devices are always on, even when they're turned off.

Some appliances can use more power in standby mode than in actual use. A typical 1,400 watt microwave, for example, draws about three watts per hour - that's 72 watts over a day. Running the microwave for three minutes at full power, on the other hand, uses 70 watts.

Among the worst offenders are cable and satellite TV set-top boxes - particularly those with on-demand and video recording abilities. On average, these draw 30 or more watts per hour in "off mode," even when they're not recording. That adds up to more than 260 kilowatt-hours per year.

Though it may seem frightening to the energy-conscious consumer, busting the phantom load ghost is possible with a few simple power-conservation measures. Unplugging kitchen appliances that are not in use can save lots of power in the long term. A power strip with an off switch can also help keep multiple devices from wasting energy when they're not being used.

Unplugging laptop and mobile phone chargers once devices are charged can also help. Some mobile phone chargers use as much as a watt of power when they're not connected to the phone, and waste up to four times that to continue charging a phone that has already been fully charged.

Finally, there are several electricity meters available to consumers that can help them pinpoint where their power dollars are going. Serving as a bridge between the wall outlet and the appliance to be monitored, these electricity meters measure the amount of power an appliance consumes when on or off, empowering consumers to use energy more wisely and significantly cut their electric bills.

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    • baygirl33 profile image

      victoria 4 years ago from Hamilton On.

      Thank you for all that information!

      I turned off all the stuff that wasn't absolutely necessary. I found you while looking for information on whether to replace my old washer/dryer set and my old t.v.

      I'm kind of at a loss about all those initials on the t.v. adds.I know I want a led not a plasma but after that ...stuck.

      Thank you so much for your hub and research.

    • thebiologyofleah profile image

      Leah Kennedy-Jangraw 5 years ago from Massachusetts

      Very informative article especially since you wrote it from not just the perspective of saving money on our bills but also the environmental aspect.

    • nifwlseirff profile image

      Kymberly Fergusson 5 years ago from Villingen Schwenningen, Germany

      I was incredibly surprised to find my toaster drew power, when plugged in, but not in use! It was certainly interesting to measure the standby power throughout the house. I'm happy that my current microwave doesn't pull power on standby! Now most appliances are unplugged, or the powerboards switched off when not in use.

    • somethgblue profile image

      somethgblue 5 years ago from Shelbyville, Tennessee

      Great Article Scott, hopefully many will read it and then take action. I made sure my phone charger was turned off half way through the article.

      I also liked the chart with power usage that was a good touch.