Which of the following occurs every time energy changes form?

• A. Some energy is converted to heat and becomes less available for doing work.
• B. All energy is completely conserved without any loss.
• C. Energy is destroyed during the transformation.
• D. The total amount of energy in the universe increases.

Answer: (A)

Verified step by step guidance

1. Understand the Law of Conservation of Energy, which states that energy cannot be created or destroyed, only transformed from one form to another.
2. Recognize that during any energy transformation, some energy is always converted into heat due to inefficiencies, making it less available to do useful work.
3. Recall the concept of entropy from the Second Law of Thermodynamics, which explains why energy transformations are never 100% efficient and why some energy disperses as heat.
4. Evaluate each option in the problem: energy is never destroyed, total energy does not increase, and complete conservation without loss is ideal but not practical due to heat loss.
5. Conclude that the correct statement is that some energy is converted to heat and becomes less available for doing work every time energy changes form.