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.
Be able to compute how much energy is stored in an electrical storage device like a battery or a capacitor. 1  The voltage across the device is a measure of the energy-in joules-that a unit charge-one couloumb-will dissipate when it flows through the device.n other words, the power flowing into the battery is: P = - Vb Ir = - 12 * 0.5 = - 6w. 1  The power flowing into the battery is negative! 2  The power flowing out of the battery is positive! 3  And, it makes sense because we know the battery supplies power. 4  Batteries are often rated in ampere-hours (or milliampere-hours) and an ampere-hour is really a ...