Which of the following is NOT a renewable source of energy?
Correct answer: C. Coal
- A. Solar
- B. Wind
- C. Coal
- D. Hydroelectric
Explanation
Coal is a fossil fuel formed over hundreds of millions of years, so it is consumed far faster than it can be replaced and its combustion releases carbon dioxide. Solar, wind and hydroelectric are all replenished continuously by natural processes. Pakistan's electricity mix relies heavily on hydroelectric and thermal generation.
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About Energy Losses and Efficiency
Efficiency compares useful output energy or power with the total input, usually expressed as a percentage. The topic covers energy losses through friction, heating, resistance and sound, along with power ratings and Sankey diagrams. Efficiency is not the same as conservation of energy, because lost energy is transferred rather than destroyed.
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