Energy Resources

Energy Resources

Middle School

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Learning Objectives

• Define and differentiate between renewable and nonrenewable resources.

• Describe various types of renewable and nonrenewable energy sources.

• Explain the concepts of net energy and energy efficiency in energy resources.

• Understand that energy is conserved when it is converted from one form to another.

Key Vocabulary

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Natural Resource

Any useful material found in nature that humans can use to survive and meet their needs.

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Renewable Resource

An energy source that can be replaced naturally within a human lifetime, making it sustainable for use.

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Non-Renewable Resource

An energy source that takes millions of years to form and cannot be replenished in a useful timeframe.

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Fossil Fuels

Non-renewable resources like coal, oil, and gas, formed from the remains of ancient plants and animals.

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Net Energy

The total amount of usable energy available from a resource minus the energy used to obtain it.

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Energy Efficiency

A measurement of how much useful work is produced from a single unit of energy that is consumed.

Key Vocabulary

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Conservation

The practice of using natural resources wisely in order to help prevent waste and depletion.

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Hydropower

A renewable energy source that is generated from the power of moving or falling water.

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Renewable vs. Nonrenewable Resources

Renewable Resources

• These are resources that can be replenished easily and naturally within a human lifetime, making them a sustainable choice.

• They are derived from sources that are constantly available or are quickly replaced, such as sunlight, wind, and water.

• Living organisms like plants and animals are also considered renewable because they can be regrown or repopulated over time.

Nonrenewable Resources

• These are resources that cannot be replenished in a useful amount of time, often taking millions of years to form.

• Our consumption rate of these resources, such as coal and oil, far exceeds the speed at which they are created.

• Rocks and minerals are also considered nonrenewable because once they are mined and used, they are not replaced quickly.

Multiple Choice

What is the key difference between renewable and nonrenewable resources?

• The amount of energy they produce

• The time it takes for them to be replaced

• Where they are found on Earth

• How much they cost to use

Multiple Choice

Why are resources like sunlight, wind, and plants grouped together as renewable?

• Because they all come from the sun

• Because they are all living things

• Because they are constantly available or can be regrown

• Because they are used to create electricity

Multiple Choice

If the human consumption of coal, oil, and minerals continues at its current high rate, what is the most likely outcome?

• These resources will eventually become renewable as technology improves.

• These resources will become scarce because they are used far faster than they are formed.

• The cost of these resources will decrease as they become easier to access.

• The Earth will naturally produce more of these resources to meet the demand.

Nonrenewable Resources: Fossil Fuels

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Coal

• Coal is a solid fossil fuel that is dug from the ground.

• It is easy to transport and provides a high energy yield.

• Mining for coal can cause significant damage to the surrounding environment.

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Oil (Petroleum)

• Oil is a liquid fossil fuel formed under immense pressure underground.

• It is used to make gasoline for cars and many plastic products.

• Drilling for oil can disrupt ecosystems and cause harmful oil spills.

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Natural Gas

• This is an invisible fossil fuel often found with underground oil.

• It is primarily used for heating buildings and generating our electricity.

• Burning it releases pollutants that can contribute to our air pollution.

Multiple Choice

Which statement best describes fossil fuels like coal, oil, and natural gas?

• They are all liquid resources found underground.

• They are all used to make gasoline and plastic products.

• They are all invisible gases that pollute the air.

• They are all sources of energy formed from ancient life.

Multiple Choice

What is a primary concern associated with the processes of obtaining and using all three types of fossil fuels?

• They are difficult to transport from one place to another.

• They can cause significant harm to the environment and ecosystems.

• They are only useful for heating buildings.

• They provide a very low amount of energy compared to other resources.

Multiple Choice

A city needs a new energy source specifically for heating its buildings and generating electricity for its power grid. Based on their primary uses, which fossil fuel would be the most logical choice?

• A mix of coal and oil, because they provide high energy.

• Natural Gas, because it is primarily used for heating and electricity generation.

• Coal, because it is a solid and easy to transport.

• Oil, because it is used to make gasoline for cars.

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Renewable Resources: An Overview

• Solar power from the sun's rays is clean but can be expensive.

• Wind power uses turbines for clean energy but is limited to windy areas.

• Hydropower uses moving water, but dams can harm the river's environment.

• Geothermal and biomass energy are also cleaner-burning fuel sources.

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Multiple Choice

What is the main characteristic that solar, wind, and hydropower share?

• They can only be used in areas that are not sunny.

• They are all described as clean energy sources.

• They are all inexpensive to set up and maintain.

• They all require the construction of large dams.

Multiple Choice

What is the relationship between a renewable resource and its limitations as described in the text?

• Only the most powerful resources have limitations.

• Cleaner resources like solar and wind have no real-world drawbacks.

• The only limitation mentioned for these resources is environmental harm.

• Each resource has specific drawbacks, such as cost or location.

Multiple Choice

A community needs a clean energy source but is located in a flat, sunny area with no large rivers. Which factor would be most important for them to consider when choosing a resource?

• The high cost that can be associated with solar power.

• The need for moving water to generate hydropower.

• The fact that wind power is limited to windy areas.

• The potential harm hydropower dams can cause to river environments.

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Net Energy and Energy Efficiency

Net Energy

Energy Efficiency

• ​Energy efficiency is the measure of how much useful work can be extracted from a unit of energy.

• ​When energy changes form, some is always lost to the environment as heat.

• ​A more efficient energy source wastes less energy, saves resources, and reduces costs.

Multiple Choice

What is the definition of net energy?

• The energy that is lost to the environment as heat during conversion.

• The total energy produced by a source before any is used.

• The difference between usable energy gained and the energy spent to obtain it.

• The measure of how much useful work is extracted from a unit of energy.

Multiple Choice

According to the concept of energy efficiency, what is a primary consequence of energy changing from one form to another?

• The energy becomes more useful and concentrated.

• The net-energy ratio of the source improves.

• Some energy is always lost to the environment as heat.

• The total amount of energy increases.

Multiple Choice

A country wants to reduce its overall environmental impact and lower costs for consumers. Based on the information, which strategy would be most effective in achieving this goal?

• Focusing only on energy sources with the highest net-energy ratio.

• Switching to energy forms that produce the most heat.

• Using only energy sources that are easy to access.

• Improving the energy efficiency of devices and systems.

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Common Misconceptions

Misconception	Correction
Renewable energy has no impact on the environment.	While cleaner, hydropower dams can alter river ecosystems.
Energy can be 'created' or 'lost'.	Energy is converted from one form to another, not created or lost.
Renewable energy is always available.	Solar and wind power are intermittent and not available 24/7.

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Summary

• Energy resources are classified as renewable or nonrenewable.

• Fossil fuels are nonrenewable resources that cause pollution.

• Renewable resources include solar, wind, hydropower, biomass, and geothermal energy.

• Every energy source has unique advantages and disadvantages.

• Net energy and energy efficiency help evaluate a resource's value.

• Energy is conserved during conversion, but some is lost as heat.

Poll

On a scale of 1-4, how confident are you about the concepts covered in today's review?

• 1

• 2

• 3

• 4