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Praxis II General Science

Category - Major Ideas

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Due to the laws of thermodynamics, engines cannot be 100% efficient. In fact, modern gasoline engines have only an efficiency of between 25-30%, which means that 70% of the fuel energy is lost. What does this energy become?

Heat
Work
Tremors
Force
Wattage

Explanation

Answer: A - In a gas engine, the excess energy that is not converted into work is converted into heat, light, or sound, with the majority being heat. This is why a car gets quite warm after it has started running for a while!

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