Energy Resources and Consumption review games for AP Environmental Science.
This unit covers fossil fuels, nuclear energy, renewables and energy conservation — essential concepts for AP Environmental Science. Use our interactive study games to test your understanding, or review questions in traditional format below.
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This unit covers fossil fuels, nuclear energy, renewables and energy conservation — essential concepts for AP Environmental Science. Use our interactive study games to test your understanding, or review questions in traditional format below.
Key Concepts Breakdown
1 Fossil Fuels
Students must understand how fossil fuels form, their environmental impacts, and why they are nonrenewable. The exam tests knowledge of combustion products, extraction methods, and how fossil fuel use drives climate change through greenhouse gas emissions.
Key Points
- Fossil fuels (coal, oil, natural gas) form from compressed organic matter over millions of years — nonrenewable on human timescales
- Combustion produces CO2, SO2, NOx, and particulates; SO2 and NOx cause acid deposition
- Coal extraction via surface mining causes habitat destruction and acid mine drainage; hydraulic fracturing (fracking) risks groundwater contamination
- Net energy ratio (energy returned ÷ energy invested) is highest for conventional oil/gas and lowest for tar sands and oil shale
A coal-burning power plant emits 900g of CO2 per kWh generated. A natural gas plant emits 450g CO2 per kWh. If a city uses 1,000,000 kWh/day, how much CO2 is avoided by switching from coal to natural gas?
Coal produces 900,000,000g (900 metric tons) CO2/day; natural gas produces 450,000,000g (450 metric tons). The difference is 450 metric tons CO2 avoided per day. This type of calculation tests whether students can evaluate trade-offs between fossil fuels — natural gas emits less CO2 but still contributes to climate change and leaks methane during extraction.
2 Nuclear Energy
Students must know how nuclear fission generates electricity, the difference between fission and fusion, and the environmental trade-offs of nuclear power. The exam frequently tests radioactive waste management, half-life concepts, and comparison of nuclear power to fossil fuels.
Key Points
- Nuclear fission splits heavy nuclei (e.g., U-235) releasing heat used to generate steam and drive turbines — no direct CO2 emissions during operation
- Radioactive waste is classified as low-level or high-level; high-level waste (spent fuel rods) requires storage for thousands of years
- Half-life is the time for half of a radioactive isotope to decay; after 10 half-lives, ~0.1% of the original material remains
- Nuclear power has low lifecycle CO2 emissions but risks include meltdown (Chernobyl, Fukushima), uranium mining impacts, and long-term waste storage with no permanent U.S. repository
A radioactive isotope has a half-life of 30 years. If a nuclear facility stores 800g of this isotope today, how many grams remain after 120 years?
120 years ÷ 30 years per half-life = 4 half-lives elapsed. Starting with 800g: after 1st half-life = 400g, 2nd = 200g, 3rd = 100g, 4th = 50g. After 120 years, 50g remains. This half-life calculation is a standard exam question format that also reinforces why long-lived isotopes pose multi-generational storage challenges.
3 Renewable Energy
Students must be able to compare solar, wind, hydroelectric, geothermal, and biomass energy in terms of how each works, their advantages, and their specific environmental drawbacks. The exam tests both mechanisms and trade-offs — no renewable source is presented as without impact.
Key Points
- Solar PV converts sunlight directly to electricity; solar thermal uses sunlight to heat fluid — both intermittent and require land area
- Wind turbines convert kinetic energy to electricity; impacts include bird/bat mortality, noise, and visual disruption; best in open plains or offshore
- Hydroelectric dams provide reliable baseload power but fragment river ecosystems, block fish migration, displace communities, and trap sediment
- Geothermal uses Earth's internal heat; reliable and low-emission but geographically limited to tectonic boundaries; biomass is carbon-neutral only if sustainably managed
A region installs wind turbines that each produce 2 MW and operate at 35% capacity factor. How many turbines are needed to replace a 700 MW coal plant operating at 85% capacity?
The coal plant's actual output = 700 MW × 0.85 = 595 MW. Each wind turbine's actual output = 2 MW × 0.35 = 0.7 MW. Turbines needed = 595 ÷ 0.7 ≈ 850 turbines. This example tests capacity factor, a concept the AP exam uses to illustrate why intermittent renewables require more nameplate capacity than equivalent fossil fuel plants.
4 Energy Conservation
Students must understand strategies for reducing energy consumption at individual, building, and systems levels, and how energy efficiency differs from energy conservation. The exam tests CAFE standards, green building concepts, and the rebound effect.
Key Points
- Energy efficiency = doing the same work with less energy input (e.g., LED vs. incandescent bulbs); energy conservation = changing behavior to use less energy
- CAFE (Corporate Average Fuel Economy) standards require automakers to meet fleet-wide MPG targets, reducing transportation sector fuel use
- Cogeneration (combined heat and power, CHP) captures waste heat from electricity generation for space/water heating, raising overall system efficiency above 80%
- The rebound effect: efficiency gains lower the cost of energy use, causing increased consumption that partially offsets the efficiency savings
A household replaces 20 incandescent bulbs (60W each) with LED bulbs (9W each). If the bulbs run 5 hours/day, calculate the annual kWh savings and explain how the rebound effect might reduce actual savings.
Power saved per bulb = 60 − 9 = 51W. Total power saved = 51W × 20 bulbs = 1,020W = 1.02 kW. Annual savings = 1.02 kW × 5 hrs/day × 365 days = 1,861.5 kWh/year. The rebound effect predicts that because LEDs are cheaper to run, the household may leave lights on longer or in more rooms, reducing actual net savings below the theoretical 1,861.5 kWh — a key exam distinction between theoretical and realized efficiency gains.
Questions, answered.
What is Energy Resources and Consumption?
Energy Resources and Consumption is Unit 6 of AP Environmental Science, covering fossil fuels, nuclear energy, renewables and energy conservation.
How to study for AP Environmental Science Unit 6?
Start with the Quick Summary above, review the Key Concepts, then test yourself with our interactive study games. Aim for 80%+ accuracy before moving on.
How many questions are in this unit?
This unit has 30+ review questions across 5 different game modes.