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.
Milliampere Hours. One milliampere hour is the amount of capacity needed to let one milliampere of electrical current flow for one hour. When charged, a battery effectively has a âreservoirâ of capacity. If the battery only needs to supply a small current, that reservoir may last for a long time before becoming drained.o calculate a battery's life, divide the capacity of the battery by the current required by the object it is powering. For example, imagine that you have two batteries for your cell phone, one with a capacity of 1000 mAh and one with a capacity of 2000 mAh, and that your phone requires a current of 200 mA to function.