Hydroelectricity and tidal barriers

• What are the two systems used to generate electrical power discussed in the video?

  Hydroelectric dams and tidal barrages
• How do hydroelectric dams and tidal barrages generate electricity?

  By using differences in water levels
• What is the main difference between hydroelectric dams and tidal barrages?

  What causes the difference in water levels
• What is created when water is trapped behind a hydroelectric dam?

  A reservoir
• What natural phenomenon do tidal barrages utilize to generate power?

  The cyclic rise and fall of sea levels
• What primarily causes tides?

  The moon's gravity
• Where are tidal barrages typically placed?

  In estuaries where rivers meet the ocean
• What type of energy is converted into electricity in hydroelectric systems?

  Gravitational potential energy
• How does the water released from reservoirs contribute to electricity generation?

  It spins the blades of turbines
• What happens to the water after it passes through the turbines in a dam?

  It flows back into the river
• What are the pros and cons of hydroelectric dams and tidal barrages?

  Pros:

  • Generate large amounts of energy
  • No pollution
  • Reliable electricity sources
  • Low running costs
  • Scalable for different sizes

  
  

  Cons:

  • Significant environmental impact
  • Flooding of large areas
  • Disruption of fish migrations
  • High initial setup costs
• Why are hydroelectric dams considered reliable sources of electricity?

  They can respond immediately to demand
• What is a major environmental concern associated with hydroelectric dams?

  They can flood important habitats
• How do hydroelectric dams and tidal barrages affect fish migrations?

  They can block fish from traveling
• What is a common disadvantage of both hydroelectric dams and tidal barrages?

  High initial setup costs