Circle the letter of the sentence that explains why no machine is 100% efficient. A. Electrical energy is transformed to mechanical energy by fuel. B. Mechanical energy is transformed to thermal energy by friction. C. Thermal energy is transformed to mechanical energy by friction. D. Mechanical energy is transformed to electrical energy by a spark.

Question

Physics

Janelle Cabrera

5 April, 05:40

Circle the letter of the sentence that explains why no machine is 100% efficient. A. Electrical energy is transformed to mechanical energy by fuel. B. Mechanical energy is transformed to thermal energy by friction. C. Thermal energy is transformed to mechanical energy by friction. D. Mechanical energy is transformed to electrical energy by a spark.

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Marlene Duarte · Answer 1

B. Mechanical energy is transformed to thermal energy by friction.

When a machine is not 100% efficient, this means that some form of energy is being lost as thermal energy due to frictional force which is opposing the working of machine. Hence, less than 100% efficiency means that mechanical energy is transformed to thermal energy by friction.