Energy Efficiency

Efficiency is...

• The percentage of energy that is actually used to do work

• The stuff in the walls that keeps energy in

Leaving lights on in vacant rooms, washing clothes in hot water, and driving alone are examples of what?

• low energy efficiency

• moderate energy efficiency

• high energy efficiency

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To increase the EFFICIENCY of energy use, we could...

• Turn off lights when not in use

• Keep the car running as you go into the store

• Water the plants in a drought

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

• heat

• chemical energy

• light

• sound waves

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The percentage of energy put into a system that does useful work is:   

• energy conservation

• renewable energy

• energy efficiency

• energy conversion

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Using energy but using it better

• Energy Efficiency

• Kinetic Energy

• Renewable Energy

• Non-Renewable Energy

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the percentage of energy put into a system that does useful work.

• Energy Conservation

• Energy Efficiency

• Energy Wattage

• Electricity

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In the context of energy efficiency, what does the term "waste energy" refer to?

• Energy that is stored for later use

• Energy that is converted into useful work

• Energy that is lost to the surroundings and not used for useful work

• Energy that is recycled

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(Select all true responses) In the US, which of the following would INCREASE energy efficiency?

• Using public transportation and developing more efficient engines for vehicles

• Turning thermostats down in winter and up in summer

• Using insulation in the walls of homes and businesses

• Buying a car for everyone in the house older than 16

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Which of the following is an example of energy efficiency?

• A light bulb that converts 90% of electrical energy into light

• A car engine that converts 30% of fuel energy into motion

• A heater that converts 50% of electrical energy into heat

• A solar panel that converts 20% of sunlight into electricity