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.
Batteries differ not just by how much energy they can hold but by what kinds of chemicals they have inside them. The chemical type dictates how large and heavy a battery has to be to hold a certain amount of energy, how expensive it is to make, whether it can be recharged, and how toxic it is.