Energy (from Ancient Greek ἐνέργεια (enérgeia) 'activity') is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in …

Sep 5, 2025 · Energy can be neither created nor destroyed but only changed from one form to another. This principle is known as the conservation of energy or the first law of thermodynamics.

Nov 27, 2017 · Get the definition of energy in science, especially physics and chemistry, along with examples of different forms of energy.

Dec 10, 2024 · Scientists define energy as the ability to do work. Modern civilization is possible because people have learned how to change energy from one form to another and then use it …

4 days ago · Solar energy is the fastest growing and most affordable source of new electricity in America. As the cost of solar energy systems dropped significantly, more Americans and …

Explore data on how energy production and use varies across the world.

Mar 13, 2025 · Learn about clean energy, the impact of energy on the environment, and U.S. electricity generation. Clean energy includes renewable energy, energy efficiency and …