Different calculations for the production, storage and conversion of energy can be performed here. Oversimplified, energy is needed to move things. The international standard unit for energy is joule. When dealing with electricity, the energy often is given in watt-hours (Wh). One joule is one watt-second and as one hour has 3600 seconds, one watt-hour equals 3600 joules. An obsolete unit, which commonly is only still used for the heating value of food, is the calorie. One calorie is 4.1876 joules.
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