Efficiency

What is the law of conservation of energy?

• energy can be created but cannot be destroyed

• energy cannot be created or destroyed, but it can be transformed

• energy can be destroyed but not created

• energy cannot be created destroyed or transformed

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What is this diagram called?

• Stankey Diagram

• Sankey Diagram

• Sankay Diagram

• Samkay Diagram

Where does most of the energy go in this transformation.

• Electrical energy
• Light
• Heat
• other

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In energy transformations, "wasted energy" usually takes what form?

• heat
• chemical energy
• light
• sound waves

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• 100%

• 80%

• 40%

• 10%

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A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

• 5%

• 50%

• 55%

• 100%

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What type of device might this Sankey be about?

• A very efficient LED light bulb

• A very inefficient incandescent light bulb

• A coal power plant

• A wind turbine

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No machine in existence has 100% efficiency.

• False

• True

What is the useful energy output of a washing machine?

• Kinetic Energy

• Sound Energy

• Light Energy

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If the useful energy of this device is light energy, is this device efficient?

• No - lots of energy is wasted.

• Yes - 10% efficiency is a high value.