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- 1. Multiple Choice
An open system is...
an object with a hole in it
an object which gains or loses energy
an object which does not let energy in or out
an object that is outside
- 2. Fill in the Blank
Almost all objects lose energy in the form of __________.
- 3. Multiple Choice
Select the correct equation:
- 4. Fill in the Blank
A __________ diagram shows the energy transfers in a system.
- 5. Fill in the Blank
What is the value of the wasted energy?
- 6. Fill in the Blank
As a percentage, what is the efficiency of the bulb represented by the Sankey diagram?
- 7. Fill in the Blank
What type of energy is useful?
- 8. Multiple Choice
Which bulb is the most efficient?
Filament bulb
LED light
CFL lamp
- 9. Fill in the Blank
A device transfers 600 J of electrical energy into 350 J of useful sound energy. Calculate the efficiency of the device to 2 significant figures.
- 10. Fill in the Blank
A bulb is 70% efficient. It produces 49 J of light energy. How much energy is inputted?
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