The efficiency of a heat engine working between the freezing point and the boiling point of water is near to:
Correct answer: B. 25%
- A. 50%
- B. 25%
- C. 12.5%
- D. 6.25%
Explanation
Boiling point of water= 100° =373KFreezing point of water=0° = 273KThe formula for efficiency; =1-TCold/Thotx100 = 1- 273/373x100 =26.80% ≈25%NOTE: make sure the temperature values being used in the formula are in Kelvin.In the numerator, we always take the cold body's temperature.In the denominator, we always take the hot body's temperature.
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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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