Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: When electricity is used to run appliances in a building, the electricity is measured in kilowatt-hours. Which of these units could be used in place of "kilowatt-hour"?
watt-hour, megawatt-hour, hour, kilowatt, ampere-hour, volt-ampere-reactive