Which statement about primary energy is true?

• A. Secondary Energy Results From Energy Conversion.
• B. Primary Energy Refers to Energy After Conversion.
• C. Primary Energy Is Energy Contained in Natural Resources Before Conversion.
• D. Primary Energy Is Only Renewable Energy.

Answer: (C)

Primary energy is the energy stored in natural resources before any transformation into usable forms. This means it includes fuels and energy from nature in their raw form—crude oil, coal, natural gas, uranium, wood, sunlight, wind, and other sources. Once those resources are converted—oil refined into gasoline, coal burned for electricity, sunlight captured by solar panels to make electricity—that resulting energy form is called secondary energy. So the true statement captures the idea that primary energy is the energy contained in natural resources before conversion. The other ideas describe energy after conversion or mischaracterize what primary energy can include, since primary energy is not limited to renewables and is not defined by what happens after conversion.