Energy Conversion at Grade 12
This worksheet explores various forms of energy, their conversions, and the principles governing these transformations, suitable for Grade 12 science students.
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Topics
Energy Conversion: Principles and Applications
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Read each question carefully and answer to the best of your ability. Show all work for calculations.
1. Which of the following best describes the Law of Conservation of Energy?
Energy can be created but not destroyed.
Energy can be destroyed but not created.
Energy can neither be created nor destroyed, but it can be transformed from one form to another.
Energy is always conserved as heat.
2. In a hydroelectric power plant, which energy conversion takes place?
Chemical energy to electrical energy.
Kinetic energy to potential energy.
Potential energy to kinetic energy to electrical energy.
Thermal energy to mechanical energy.
3. The efficiency of an energy conversion process is defined as the ratio of to .
4. According to the Second Law of Thermodynamics, during any energy conversion, some energy is always lost as , increasing the total of the universe.
5. It is possible to create a machine with 100% energy conversion efficiency according to the laws of thermodynamics.
True
False
6. Photosynthesis is an example of chemical energy being converted into light energy.
True
False
7. Explain the concept of an energy pyramid in an ecosystem, and how it relates to energy conversion.
8. Describe the energy conversions that occur when a car engine burns gasoline to power the vehicle.
Match each energy conversion example with the primary energy conversion occurring.
9. Solar panel
a. Chemical to Electrical
10. Battery discharging
b. Light to Electrical
11. Burning wood
c. Chemical to Thermal and Light
12. Electric motor
d. Electrical to Mechanical
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