Energy resources flashcards

Energy resources are divided into nonrenewable sources, such as fossil fuels and nuclear fuels, and renewable sources, such as solar, wind, hydroelectric, geothermal, and biomass. Students must understand how each source is formed, extracted, and converted into usable energy, as well as the environmental costs associated with each. Key concepts include net energy yield, energy efficiency, and the difference between proven reserves and total resources. Students should be able to compare the advantages and disadvantages of each energy type, including air pollution, land use, water use, and carbon emissions. Understanding the role of energy policy, subsidies, and the transition toward cleaner energy systems is also essential. The environmental impacts of burning fossil fuels, including climate change and acid deposition, connect energy resources to many other topics in the course.

1. Card 1

   What is the difference between a renewable and a nonrenewable energy resource?

   Renewable resources replenish naturally on a human timescale; nonrenewable resources form over millions of years and are depleted faster than they regenerate.

2. Card 2

   What are the three main fossil fuels and how are they formed?

   Coal, oil, and natural gas form from ancient organic matter compressed and heated over millions of years under sedimentary rock layers.

3. Card 3

   What is net energy yield and why does it matter?

   Net energy yield is the usable energy remaining after subtracting the energy needed to extract and process a fuel. A low yield means less practical benefit from that source.

4. Card 4

   How does nuclear fission generate electricity?

   Nuclear fission splits uranium-235 atoms, releasing heat that boils water into steam, which spins a turbine connected to a generator to produce electricity.

5. Card 5

   What environmental problems are associated with burning coal?

   Burning coal releases CO2, sulfur dioxide, nitrogen oxides, and particulates, contributing to climate change, acid deposition, and respiratory illness.

6. Card 6

   What is the difference between photovoltaic solar energy and solar thermal energy?

   Photovoltaic cells convert sunlight directly into electricity; solar thermal systems use sunlight to heat a fluid that drives a turbine or heats buildings.

7. Card 7

   What environmental concerns are linked to large hydroelectric dams?

   Large dams cause habitat destruction, block fish migration, displace communities, alter sediment flow, and can emit methane from decomposing organic matter in reservoirs.

8. Card 8

   What is the environmental advantage of natural gas compared to coal?

   Natural gas emits roughly half the CO2 per unit of energy as coal and produces fewer particulates, making it a cleaner-burning fossil fuel, though methane leakage is a concern.

9. Card 9

   How does geothermal energy work and where is it most available?

   Geothermal energy taps heat from Earth's interior, usually near tectonic plate boundaries or hotspots, to produce steam that drives turbines or heats buildings directly.

10. Card 10

    What is energy efficiency and how does it relate to the second law of thermodynamics?

    Energy efficiency is the ratio of useful energy output to total energy input. The second law of thermodynamics states that every energy conversion loses some energy as heat.

11. Card 11

    What are the main environmental drawbacks of wind energy?

    Wind turbines can kill birds and bats, create noise, require large land areas, and produce intermittent power since electricity generation depends on variable wind speeds.

12. Card 12

    What is hydraulic fracturing and what environmental concerns does it raise?

    Hydraulic fracturing (fracking) injects high-pressure fluid into rock to release natural gas. Concerns include groundwater contamination, induced seismic activity, and methane emissions.

• Many students assume nuclear energy is a renewable resource because it produces low carbon emissions, but uranium is a finite nonrenewable fuel that must be mined.
• Students often confuse energy efficiency with energy conservation, not realizing that efficiency refers to the ratio of useful output to input, while conservation means simply using less energy overall.
• A common error is thinking that renewable energy sources have no environmental impact, when in reality each has drawbacks such as land use, habitat disruption, or intermittency that must be weighed against their benefits.

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