How to Figure the Electric Usage on Small Appliances
Whenever you dry your hair, toast a bagel or turn on your computer, you are using electricity. Even when you sleep, your refrigerator, alarm clock and phone charger are still using energy. Calculating how much electricity your small appliances are using can be eye-opening, and it can help you save money by letting you know which appliances are costing you the most. It can also tell you if switching to a more energy efficient appliance would be an economical decision. The calculation for determining electric usage is a simple matter of multiplication.
Instructions
- 1 Find the wattage of the appliance. Check the big white tag on the cord of the appliance or the user manual for this number.
Some appliances may give volts and amps instead of wattage. In this case, calculate the wattage by multiplying the volts and the amps. If you have a toaster that uses 12 volts and 2 amps, you have a 24 watt toaster.
2 Estimate the number of hours per day, week or year that you use the appliance, depending on the time frame for which you want to determine the electric usage. You can also use "one hour" if you simply want to know how much energy your appliance uses per hour.
3 Multiply the wattage by the number of hours, then divide by 1000. Electric usage is measured in kilowatt hours (kWh), and there are 1000 watts in a kilowatt, so you have to divide by 1000 to obtain the proper units.
To illustrate, if you use your 24 watt toaster for half an hour every day, your toaster uses ( 24 W x .5 H ) / 1000 = .012 kWh per day.
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How to cut back on your electricity usage by knowing what your electrical devices use.
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Electric Usage on Small Appliances
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