Page Content 1. UT Extension serves the citizens of Fayette County with educational programs in the areas of Agriculture, Family and Consumer Sciences, Community Resource Development, and 4-H Youth Development.
A large globe light, like around a vanity mirror, that is rated at 25 watts consumes exactly the same amount of energy as a small refrigerator light bulb also rated at 25 watts..  Size as a power ratingThe wattage rating of a light bulb is directly proportional to energy consumed by that light bulb. A light bulb rated at 60 watts consumes 50% more energy than a 40 watt light bulb.
However, the actual energy storage capabilities of the battery can vary significantly from the nominal rated capacity, as the battery capacity depends strongly on the age and past history of the battery, the charging or discharging regimes of the battery and the temperature.