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What is wattage? Also, what is a kilowatt-hour or a kWh?

​ ​Wattage measures the work being done at a given point and time. It’s found by multiplying voltage by the current flowing in a wire. For example, a 100-watt light bulb burning for 10 hours uses 1,000 wattage hours — or one kilowatt hours (kWh). A kwh equals 1,000 watts used for one hour.
Kilowatt-hours are the measurements that Oncor uses to determine your electric consumption. Similar to how a gas station will charge you for gas by the gallon, Retail Electric Providers charge you for electricity by the kWh.
-Bill M., Oncor Research Expert​