Energy is defined as...

Energy is defined as...

• A. The energy stored in a battery
• B. Nothing can be done with energy without a machine
• C. Energy that is produced by chemical reactions
• D. Universally used to do some form of work

Answer: (D)

Energy is the ability to do work or cause change. That broad idea means energy shows up in many forms and sources, but its role is to enable effects in the world—moving objects, heating things, changing states, and so on. The best statement here captures that universal role: energy is used to do some form of work. It isn’t limited to stored energy in a battery or energy produced by chemical reactions; those are examples of energy, not the full definition. Energy can cause changes or perform work in countless situations, even without a machine—like gravity making a falling object do work on the surface, or heat transferring to raise temperature. So the definition that energy is the capacity to do work fits all those scenarios, which is why it’s the correct choice.

Energy is the ability to do work or cause change. That broad idea means energy shows up in many forms and sources, but its role is to enable effects in the world—moving objects, heating things, changing states, and so on.

The best statement here captures that universal role: energy is used to do some form of work. It isn’t limited to stored energy in a battery or energy produced by chemical reactions; those are examples of energy, not the full definition. Energy can cause changes or perform work in countless situations, even without a machine—like gravity making a falling object do work on the surface, or heat transferring to raise temperature. So the definition that energy is the capacity to do work fits all those scenarios, which is why it’s the correct choice.