The Law of Conservation of Energy states:
Energy Efficiency

Flashcard
•
Science
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Energy cannot be created or destroyed, it can only be transformed.
2.
FLASHCARD QUESTION
Front
What kind of energy does an object possess when it's resting on top of the hill?
Back
Potential Energy
3.
FLASHCARD QUESTION
Front
A kettle uses 100J of electrical energy to produce 7J of sound energy and 93J of thermal energy. How efficient is the kettle?
Back
93%
4.
FLASHCARD QUESTION
Front
A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?
Back
50%
5.
FLASHCARD QUESTION
Front
What type of device might this Sankey be about? Options: A very efficient LED light bulb, A very inefficient incandescent light bulb, A coal power plant, A wind turbine
Back
A very inefficient incandescent light bulb
6.
FLASHCARD QUESTION
Front
Why does no machine in existence have 100% efficiency?
Back
friction
7.
FLASHCARD QUESTION
Front
To save energy, what should you do when you leave a room?
Back
Shut off the lights and television.
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