What is a kilowatt hour

What is the difference between Watts and Watt-hours? Before we see how much electricity costs, we have to understand how it’s measured.  When you buy electricity they charge you by the kilowatt-hour (kWh).  When you use 1000 watts for 1 hour, that’s a kilowatt-hour.  For example: Device Wattage Hours used kWh medium window-unit AC 1000 […]