First off lets start with the definition. Watt hours are a unit of energy, usually electrical energy, equal to the work done by a single watt acting for one hour. This is also the equivalent of 3600 Joules. In order to calculate Watt hours you need to do some multiplication. First off you take the Watt rating of the product and multiply that by the amount of time used in hours. A 40 W bulb will use 120 Watt hours over a period of three hours.
This gives you the most basic understanding of watt hours. Watt hours are the → Read the Full Article