Energy 101

Energy Systems

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An energy system is composed of interconnected parts that transform raw energy sources—oil, coal, hydro, nuclear, and other—into more useful energy commodities that provide us with energy services—electricity, gas for our automobiles, and natural gas to heat our homes for example.

Energy services include heating, cooling and powering of appliances in homes and buildings. They also include powering industrial processes, and providing power for transportation. Whenever we use an energy service—to turn on a light, squeezing a gas pump, heating our homes—we are activating an energy system.

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