Why Is Energy Efficiency an Important Energy Resource

The percent of energy that is used for work

• Energy efficiency

• Renewable energy

• Nonrenewable energy

• Combustion

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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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NGSS.HS-PS3-3

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

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NGSS.HS-PS3-3

Why is energy efficiency considered an important energy resource?

• It reduces the need for energy imports

• It increases the total energy supply

• It decreases the cost of energy production

• It enhances the speed of energy consumption

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Which of the following best describes energy efficiency?

• The ability to generate more energy from renewable sources

• The ratio of useful output energy to input energy

• The total energy consumed by a system

• The speed at which energy is consumed

What is a common method to improve energy efficiency in buildings?

• Installing solar panels

• Using LED lighting

• Increasing the number of windows

• Using more electrical appliances

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How does energy efficiency contribute to environmental protection?

• By increasing the use of fossil fuels

• By reducing greenhouse gas emissions

• By promoting deforestation

• By increasing energy consumption

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Which of the following is a real-world application of energy efficiency?

• A car that uses more fuel to travel the same distance

• A refrigerator that uses less electricity to keep food cold

• A heater that consumes more energy to produce the same heat

• A light bulb that emits more heat than light

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NGSS.HS-PS3-3

What is the impact of energy efficiency on energy bills?

• It increases energy bills

• It has no effect on energy bills

• It reduces energy bills

• It doubles energy bills

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NGSS.HS-ESS3-2

Which scientific principle is directly related to energy efficiency?

• Conservation of mass

• Conservation of energy

• Newton's third law

• Law of universal gravitation

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NGSS.HS-PS3-4