Chapter 8 Review

Test Description: Exam review

Instructions: Answer all questions to get your test result.

1) A car engine is only 33% efficient, if the car requires 456 J of work to operate, what is the car’s work output?

2) Batteries are devices that change chemical energy to ______ energy

3) Carl eats a chocolate chip cookie and then climbs up a set of stairs. In doing so the cookie is transformed into ____________ energy.

4) The efficiency of most machines is less than 100%. Due to friction, energy seems to be lost. While the energy is not lost, it does work that is not useful or it is converted ___ energy.

5) An iPod completes the following conversions:

6) As you move up through the levels of the energy pyramid, the amount of usable energy:

7) The organisms at the bottom of the food chain (food pyramid) are:

8) Where does the energy used to drive the water cycle comes from

9) When the total energy of a system remains the same over time, the system is in:

10) Calculate the overall efficiency of a device that uses two different processes with efficiencies of 80% and 15 %


*select an answer for all questions

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