The energy input to an engine is 4.00 times greater than the work it performs. What is its thermal efficiency?
Correct answer: C. 0.25
- A. 4.00
- B. 1.00
- C. 0.25
- D. Impossible to determine
Explanation
Efficiency= Output work/ Input workAs input energy is 4 times the useful work done. Efficiency=¼=0.25Hence,C is the correct option.
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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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