Which term describes an energy source that cannot be replaced as quickly as it is used?

• A. Renewable Resource
• B. Non-renewable Resource
• C. Phantom Load
• D. Secondary Cell

Answer: (B)

An energy source that cannot be replaced as quickly as it is used is described as a non-renewable resource. These sources form over geological timescales and are finite, so using them at current rates means they can run out. This term captures the idea that once these resources are depleted, they aren’t readily replenished. Examples include coal, oil, natural gas, and uranium used in some power generation. By contrast, renewable resources—like sunlight, wind, and flowing water—are replenished on much shorter timescales, so they aren’t described as non-renewable. A phantom load refers to energy drawn by devices that are plugged in but not actively used, which affects efficiency but not the replenishment rate of the resource. A secondary cell is a rechargeable battery, which stores energy for reuse, not about how quickly the energy source itself can be replaced.