The world of energy is filled with abbreviations, technical terms, and scientific phrases. As a new feature of Maria Energia, I'll attempt to explain some of those wonky words each week. Feel free to add more info in the comments section!
Q. What is a kilowatt hour?
A. A kilowatt hour (abbreviated kWh) is a unit of energy equivalent to one kilowatt (or 1,000 watts) of power lasting for one hour of time. For example, if you have a 1 kilowatt light bulb (which would be really bright - remember that'd be 1,000 watts!) and it burns for an hour, you've used one kilowatt hour of energy. A kilowatt hour is almost always used when talking about electricity.
For really big units, like a building that uses a lot of energy or a wind turbine that makes energy, that may be expressed in megawatt hours (abbreviated MWh). 1 MWh = 1,000 kWh.
via Tech Target