Hydroelectricity and tidal

• 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 a reservoir in the context of hydroelectric dams?

  A large accumulation of trapped water
• 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 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
  • Flood large areas
  • Block fish and boat migrations
  • High initial setup costs
• What is a major environmental downside of hydroelectric dams?

  They can flood large areas
• How do hydroelectric dams affect fish migrations?

  They can block fish from traveling
• What is a benefit of hydroelectric dams in terms of electricity demand?

  They can respond immediately to demand
• What is a common characteristic of both hydroelectric dams and tidal barrages regarding energy generation?

  They generate energy without pollution
• What is the main disadvantage of both hydroelectric dams and tidal barrages?

  High initial setup costs
• What happens to the gravitational potential energy in hydroelectric systems?

  It is converted into electricity
• How does the force of water contribute to electricity generation in dams?

  It spins the blades of turbines
• What do turbines in hydroelectric dams connect to for electricity generation?

  Generators
• What is the outcome of the water flow after passing through turbines?

  It returns to the river