The total amount of energy in the universe never changes, but the amount of energy available for work at any given moment varies tremendously. What best explains this change in available energy?
Responses
Energy is continually changing from one form into another.
Energy can only be created through nuclear reactions.
Energy is always converted with 100 percent efficiency.
Energy is always transferred as heat.
2 answers
The best explanation for the change in available energy is that energy is continually changing from one form into another. Energy cannot be created or destroyed according to the law of conservation of energy, but it can be converted from one form to another, such as potential energy to kinetic energy or electrical energy to light energy. However, some energy is always lost as unusable heat during these conversions, leading to variations in available energy at any given moment. So, the correct answer is "Energy is continually changing from one form into another."
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