joule newton specific heat thermal expansion
I gave my students this multiple choice question: 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"?

Only one answer is correct among these 4 choices:
- joule
- newton
- specific heat
- thermal expansion

Could you tell me which one is correct?

joule