1 | What Is Energy?

What Is Energy?

  • Energy is defined as the ability to do work. In other words, it is the ability to make something happen.
  • Energy is different to matter. It is not composed of particles and, therefore, it has no mass and cannot been seen.
  • The effects of energy, however, can be observed and measured.
  • For example, energy can make objects move, heat up objects or produce light and sound.
  • Energy, therefore, is measured based on how much work is being done or how much work could potentially be done.
  • Energy comes in many forms. The two main categories of energy are kinetic energy, which is active energy, and potential energy, which is inactive energy.
  • The units for measuring energy are called joules, which have the symbol J.


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Energy is the ability to make something happen.

(Images: tkyszk, Adobe Stock; Pixel-Shot, Adobe Stock; Dusan Kostic, Adobe Stock)