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  • What Nutrients Provide Energy? There are three main nutrients that provide energy which are carbohydrates, proteins and fats. They are also called macronutrients and are needed for metabolism, growth and other body functions.

  • What are the sources of energy for doing work?

  • In the United States and many other countries, most energy sources for doing work are nonrenewable energy sources: These energy sources are called nonrenewable because their supplies are limited to the amounts that we can mine or extract from the earth.

  • What is energy in physics?

  • Energy, in physics, the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or various other forms. There are, moreover, heat and work鈥攊.e., energy in the process of transfer from one body to another. Learn more about energy in this article.

  • How do we use electricity as an energy source?

  • Learn more about how we use electricity as an energy source. The Energy Department is developing new technologies that will store renewable energy for use when the wind isn’t blowing and the sun isn’t shining. Fuel cells use the energy from hydrogen in a highly efficient way — with only water and heat as byproducts.

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