The basic unit of measurement for electricity is watts. One kilowatt is called a kilowatt. When electricity is supplied with a vacuum of 1000 watts for 1 hour, 1,000 watt-hours (1,000 Wh) are used. One kilowatt hour is equal to one kilowatt hour (kWh). The utility bill usually shows the kWh charge you used.

The meter uses a digital display or turntable. The difference between one month's reading and the next month's reading is the number of energy units used during the billing period. You may wish to contact your local utility company for instructions on how to read the meter.

Smart meter
Millions of smart meters have been installed throughout the country. Smart meters can provide two-way communication between you and your utilities, for example, to help your utilities understand power outages. This helps utility companies maintain more reliable power services.

Smart meters can be used with home energy management systems, such as web-based tools provided by utilities or devices that can be installed in homes. Smart meters can display your home's energy usage, help you find ways to save energy and money, and you can even adjust the thermostat or turn off appliances remotely.

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