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We know that the law of conservation of energy states that energy can not be created or destroyed. It only changes form. Consider this energy transformation diagram. Assume that the energy input in this case is chemical potential energy and the useful energy output is kinetic energy, specifically a small fan to keep you cool. The diagram also shows how to calculate the efficiency of the fan. If the law of conservation of energy holds true, explain why the efficiency of the fan is not 100%.

A) No machine is ever 100% efficient; some energy is not transformed.
B) Some of the chemical potential energy is destroyed during the energy transformation.
C) Some of the chemical potential energy is transformed into heat energy as well as kinetic energy.
D) Conservation of energy also implies that some of the chemical potential energy is conserved or not used to run the fan.

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  1. I think the answer is C, is this correct?

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  2. Yes, C

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    Damon
  3. The fan motor gets hot :)

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    Damon
  4. Thank you! :)

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  5. its C i think

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