AP Environmental Science Flashcards: Hydroelectric Power

What this deck covers

This deck focuses on Hydroelectric Power, giving you a quick way to review the definitions, rules, and examples that matter most for AP Environmental Science.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: What percentage of global electricity is provided by hydroelectric power?

Answer: Approximately 16%. Significant renewable energy source, though varies by region and development.

Flashcard 2: Identify the main advantage of run-of-the-river hydroelectric systems.

Answer: Minimal environmental and social impact. Uses natural river flow without large reservoir, reducing ecological disruption.

Flashcard 3: What is the formula for gravitational potential energy?

Answer: $E_p = mgh$. Where $m$ is mass, $g$ is gravity, and $h$ is height above reference point.

Flashcard 4: Name one advantage of hydroelectric power over fossil fuels.

Answer: Produces no direct greenhouse gas emissions. Clean renewable energy source without carbon emissions during operation.

Flashcard 5: What is the efficiency range of modern hydroelectric power plants?

Answer: 70-90%. High efficiency due to direct energy conversion without combustion losses.

Flashcard 6: What are the main maintenance challenges for hydroelectric plants?

Answer: Sediment management and equipment wear. Sediment buildup and mechanical wear require regular inspection and component replacement.

Flashcard 7: What is the role of a generator in a hydroelectric power plant?

Answer: Converts mechanical energy into electrical energy. Uses electromagnetic induction to transform turbine's rotational motion into electricity.

Flashcard 8: What is one major challenge of integrating hydroelectric power into the grid?

Answer: Seasonal variability of water flow. Drought and seasonal changes affect water availability for consistent power generation.

Flashcard 9: What is one way hydroelectric power contributes to grid stability?

Answer: Provides rapid response to demand changes. Quick startup capability helps balance supply fluctuations from variable sources.

Flashcard 10: What is one environmental benefit of hydroelectric power?

Answer: Reduces reliance on fossil fuels. Displaces carbon-intensive energy sources, helping mitigate climate change impacts.

Flashcard 11: Define the term 'hydroelectric power'.

Answer: Electricity generated by harnessing the energy of flowing water. Converts flowing water's kinetic energy into mechanical then electrical energy.

Flashcard 12: Identify the main advantage of run-of-the-river hydroelectric systems.

Answer: Minimal environmental and social impact. Uses natural river flow without large reservoir, reducing ecological disruption.

Flashcard 13: What is one benefit of hydroelectric power in terms of reliability?

Answer: Can provide base load and peak load electricity. Adjustable output allows quick response to changing electricity demand patterns.

Flashcard 14: What are the main maintenance challenges for hydroelectric plants?

Answer: Sediment management and equipment wear. Sediment buildup and mechanical wear require regular inspection and component replacement.

Flashcard 15: How does pumped-storage hydroelectric power help balance electricity supply and demand?

Answer: Stores energy during low demand, releases during high demand. Energy storage system matching electricity supply with variable consumer demand patterns.

Flashcard 16: What unit is used to measure electrical power output?

Answer: Watt (W). Standard SI unit for measuring rate of energy transfer or consumption.

Flashcard 17: Which law of physics is primarily utilized in hydroelectric power generation?

Answer: Law of Conservation of Energy. Energy cannot be created or destroyed, only transformed between different forms.

Flashcard 18: Define the term 'hydroelectric power'.

Answer: Electricity generated by harnessing the energy of flowing water. Converts flowing water's kinetic energy into mechanical then electrical energy.

Flashcard 19: Identify one social impact of constructing large dams for hydroelectric power.

Answer: Displacement of human populations. Reservoir creation floods communities, forcing relocation of affected populations.

Flashcard 20: What is the purpose of penstocks in a hydroelectric plant?

Answer: Conduct water from the reservoir to the turbines. Large pipes that channel high-pressure water directly to turbine generators.

Flashcard 21: What is the main goal of reservoir management in hydroelectric systems?

Answer: Ensure consistent water supply and flood control. Balances power generation needs with water storage and flood prevention requirements.

Flashcard 22: What is the function of a dam in a hydroelectric power plant?

Answer: To store water and create a height differential. Creates reservoir elevation to maximize gravitational potential energy for power generation.

Flashcard 23: What is the typical life expectancy of large hydroelectric dams?

Answer: 50-100 years. Durable infrastructure providing long-term renewable energy with proper maintenance.

Flashcard 24: Identify the type of energy conversion in hydroelectric power plants.

Answer: Potential energy to kinetic energy to electrical energy. Energy transforms sequentially through each stage of the hydroelectric process.

Flashcard 25: Identify one benefit of small-scale hydroelectric systems.

Answer: Minimal environmental footprint. Smaller installations cause less ecological disruption while providing local power.

Flashcard 26: What is the purpose of penstocks in a hydroelectric plant?

Answer: Conduct water from the reservoir to the turbines. Large pipes that channel high-pressure water directly to turbine generators.

Flashcard 27: Which law of physics is primarily utilized in hydroelectric power generation?

Answer: Law of Conservation of Energy. Energy cannot be created or destroyed, only transformed between different forms.

Flashcard 28: How does pumped-storage hydroelectric power help balance electricity supply and demand?

Answer: Stores energy during low demand, releases during high demand. Energy storage system matching electricity supply with variable consumer demand patterns.

Flashcard 29: Identify one benefit of small-scale hydroelectric systems.

Answer: Minimal environmental footprint. Smaller installations cause less ecological disruption while providing local power.

Flashcard 30: Name a country with significant hydroelectric power capacity.

Answer: China. World's largest hydroelectric producer with massive dam infrastructure projects.

Flashcard 31: State one environmental impact of hydroelectric power.

Answer: Alteration of aquatic habitats. Dams flood upstream areas, disrupting ecosystems and blocking fish migration.

Flashcard 32: What is one method to mitigate fish migration issues at hydroelectric dams?

Answer: Fish ladders. Stepped structures allowing fish to bypass dams during upstream migration.

Flashcard 33: What term describes the gradual buildup of sediments behind a dam?

Answer: Sedimentation. Sediment accumulation reduces reservoir capacity and turbine efficiency over time.

Flashcard 34: Identify the type of energy conversion in hydroelectric power plants.

Answer: Potential energy to kinetic energy to electrical energy. Energy transforms sequentially through each stage of the hydroelectric process.

Flashcard 35: Identify one disadvantage of hydroelectric power.

Answer: Potential displacement of communities. Large dam construction requires relocating entire communities from reservoir areas.

Flashcard 36: What is the main goal of reservoir management in hydroelectric systems?

Answer: Ensure consistent water supply and flood control. Balances power generation needs with water storage and flood prevention requirements.

Flashcard 37: Which type of hydroelectric plant stores energy by pumping water uphill?

Answer: Pumped-storage plant. Acts as energy storage system, pumping water up when excess electricity available.

Flashcard 38: What percentage of global electricity is provided by hydroelectric power?

Answer: Approximately 16%. Significant renewable energy source, though varies by region and development.

Flashcard 39: State one environmental impact of hydroelectric power.

Answer: Alteration of aquatic habitats. Dams flood upstream areas, disrupting ecosystems and blocking fish migration.

Flashcard 40: Name one advantage of hydroelectric power over fossil fuels.

Answer: Produces no direct greenhouse gas emissions. Clean renewable energy source without carbon emissions during operation.

Flashcard 41: What is the typical life expectancy of large hydroelectric dams?

Answer: 50-100 years. Durable infrastructure providing long-term renewable energy with proper maintenance.

Flashcard 42: What is one environmental benefit of hydroelectric power?

Answer: Reduces reliance on fossil fuels. Displaces carbon-intensive energy sources, helping mitigate climate change impacts.

Flashcard 43: What is the role of spillways in a dam?

Answer: To release excess water from the reservoir. Safety structures preventing dam overflow during high water or flood conditions.

Flashcard 44: What is the primary energy source for hydroelectric power?

Answer: Gravitational potential energy of water. Water's height creates potential energy that converts to kinetic energy when released.

Flashcard 45: What unit is used to measure electrical power output?

Answer: Watt (W). Standard SI unit for measuring rate of energy transfer or consumption.

Flashcard 46: What component converts water flow into electricity in a hydroelectric plant?

Answer: Turbine. Water flow spins turbine blades, which drive generators to produce electricity.

Flashcard 47: What is the primary energy source for hydroelectric power?

Answer: Gravitational potential energy of water. Water's height creates potential energy that converts to kinetic energy when released.

Flashcard 48: What is the function of a dam in a hydroelectric power plant?

Answer: To store water and create a height differential. Creates reservoir elevation to maximize gravitational potential energy for power generation.

Flashcard 49: What is one benefit of hydroelectric power in terms of reliability?

Answer: Can provide base load and peak load electricity. Adjustable output allows quick response to changing electricity demand patterns.

Flashcard 50: What is the primary component of a turbine in a hydroelectric plant?

Answer: Runner. Rotating blade assembly that captures water's kinetic energy for power generation.

Flashcard 51: What type of turbine is commonly used in large-scale hydroelectric plants?

Answer: Francis turbine. Mixed-flow turbine efficient for medium head applications in major facilities.

Flashcard 52: Identify one social impact of constructing large dams for hydroelectric power.

Answer: Displacement of human populations. Reservoir creation floods communities, forcing relocation of affected populations.

Flashcard 53: What is the formula for gravitational potential energy?

Answer: $E_p = mgh$. Where $m$ is mass, $g$ is gravity, and $h$ is height above reference point.

Flashcard 54: What is one potential consequence of dam failure?

Answer: Flooding downstream areas. Catastrophic failure releases massive water volumes, causing devastating downstream flooding.

Flashcard 55: What is one method to mitigate fish migration issues at hydroelectric dams?

Answer: Fish ladders. Stepped structures allowing fish to bypass dams during upstream migration.

Flashcard 56: What is the primary component of a turbine in a hydroelectric plant?

Answer: Runner. Rotating blade assembly that captures water's kinetic energy for power generation.

Flashcard 57: What is the role of spillways in a dam?

Answer: To release excess water from the reservoir. Safety structures preventing dam overflow during high water or flood conditions.

Flashcard 58: What is the role of a generator in a hydroelectric power plant?

Answer: Converts mechanical energy into electrical energy. Uses electromagnetic induction to transform turbine's rotational motion into electricity.

Flashcard 59: What is one potential consequence of dam failure?

Answer: Flooding downstream areas. Catastrophic failure releases massive water volumes, causing devastating downstream flooding.

Flashcard 60: What type of turbine is commonly used in large-scale hydroelectric plants?

Answer: Francis turbine. Mixed-flow turbine efficient for medium head applications in major facilities.

Flashcard 61: What component converts water flow into electricity in a hydroelectric plant?

Answer: Turbine. Water flow spins turbine blades, which drive generators to produce electricity.

Flashcard 62: Name a country with significant hydroelectric power capacity.

Answer: China. World's largest hydroelectric producer with massive dam infrastructure projects.