Which of the following is a unit of energy?
kilowatt-hour
The correct answer is kilowatt-hour.
British Thermal Unit (BTU): Often used in HVAC (heating, ventilation, and air conditioning) and energy production in the UK and US. 1 BTU \approx 1055 joules. Therm: A unit of energy equal to 100,000 BTU, commonly used in the billing of natural gas in the US. The kilowatt-hour is widely used for billing electricity because it relates directly to the power output of electrical devices (in kilowatts) and the duration they are used (in hours).
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