Some monitors will let you enter the amount your utility charges per kilowatt-hour and provide an estimate how much it cost to run the device since it was plugged into the monitor. Monitors are especially useful for finding the amount of kWh used over any period of time for devices that don’t run constantly, like refrigerators. If you want to know how many kilowatt-hours (kWh) of electricity the devices uses in an hour, or a day, or longer, just leave everything set up and read the display later. It will display how many watts the device uses. To find out how many watts of electricity a device is using, just plug the monitor into the electrical outlet the device uses, and then plug the device into the monitor. Before using a monitor, read the user manual. (But it can’t be used with large appliances that use 220 volts, such as electric clothes dryers, central air conditioners, or water heaters.) You can buy electricity usage monitors at most hardware stores for around $25-$50. Electricity usage monitors are easy to use and can measure the electricity usage of any device that runs on 120 volts.
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